Area
Code | Prefix | City/Switch Name
(Click for city search) | State/Prov.
Area Map | Telephone Company
Web link | Telco
Type | More
Info |
|---|
| 443 | 200 | WOODLAWN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 201 | GLENBURNIE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 202 | WOODLAWN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 203 | WEST RIVER | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 204 | PIKESVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 205 | CAMBRIDGE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 206 | PERRYVILLE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 207 | ELKTON | Maryland | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | WIRELESS PROV | More |
| 443 | 208 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 209 | HAVREGRACE | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 210 | ABERDEEN | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 212 | SPARKSGLNC | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 213 | PIKESVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 214 | ANNAPOLIS | Virginia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 215 | CHESTERTN | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 216 | DUNDALK | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 217 | ANNAPOLIS | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 218 | WORTHINGTN | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 219 | PARKVILLE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 220 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 221 | ANNAPOLIS | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 222 | WORTHINGTN | Maryland | ONVOY, LLC - MD | | More |
| 443 | 223 | ANNAPOLIS | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 224 | BALTIMORE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 225 | CAMBRIDGE | Maryland | METROPCS, INC. | | More |
| 443 | 226 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 227 | PT DEPOSIT | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 228 | CHASE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 229 | SEVERNA PK | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 230 | ODENTON | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 231 | ESSEX | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 232 | WILLARDS | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 233 | VIENNA | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 234 | SNOW HILL | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 235 | SALISBURY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 236 | CARDIFF | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 237 | NORTHBEACH | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 238 | PARKTON | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 239 | EASTON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 240 | WATERLOO | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 241 | WESTMINSTR | Maryland | ONVOY, LLC - MD | | More |
| 443 | 242 | SPARROWSPT | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 243 | FALLSTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 244 | WESTMINSTR | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 245 | ELKTON | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 246 | ELKTON | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 247 | UNION BDG | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 248 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 249 | STEVENSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 250 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 251 | BALTIMORE | Maryland | ONVOY, LLC - MD | | More |
| 443 | 252 | ELLICOTTCY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 253 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 254 | ANNAPOLIS | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 255 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 256 | NORTH EAST | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 257 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 258 | EASTON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 259 | COLUMBIA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 260 | SALISBURY | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 261 | SEVERNA PK | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 262 | CENTREVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 263 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 264 | PIKESVILLE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 265 | FORK | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 266 | GLENWOOD | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 267 | DARLINGTON | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 268 | BALTIMORE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 269 | TOWSON | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 270 | GLENBURNIE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 271 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 272 | RANDALLSTN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 273 | REISTERSTN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 274 | SEVERN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 275 | TOWSON | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 276 | COLUMBIA | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 277 | SYKESVILLE | Maryland | METROPCS, INC. | | More |
| 443 | 278 | BALTIMORE | Maryland | VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | | More |
| 443 | 279 | TOWSON | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 280 | SYKESVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 281 | COCKEYSVL | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 282 | CHESTERTN | Maryland | METROPCS, INC. | | More |
| 443 | 283 | COLUMBIA | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 284 | WATERLO238 | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 285 | COLUMBIA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 286 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 287 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 288 | ELLICOTTCY | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 289 | CATONSVL | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 290 | PARKVILLE | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 443 | 291 | HAMPSTEAD | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 292 | CROFTON | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 293 | WESTMINSTR | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 294 | WEST RIVER | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 295 | PRINCEFRCK | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 296 | WATERLO238 | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 297 | ARBUTUS | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 298 | EASTON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 299 | FALLSTON | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 300 | SYKESVILLE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 301 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 302 | CROFTON | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 303 | ABERDEEN | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 304 | ARBUTUS | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 305 | ARGRGBSNIS | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 306 | SEVERNA PK | Maryland | METROPCS, INC. | | More |
| 443 | 307 | BEL AIR | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 308 | SEVERN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 309 | ELKTON | Maryland | METROPCS, INC. | | More |
| 443 | 310 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 312 | BRYNPKLNCM | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 313 | FORK | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 314 | PARKVILLE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 315 | CATONSVL | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 316 | WOODLAWN | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 317 | CHASE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 318 | COCKEYSVL | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 319 | COLUMBIA | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 320 | BALTIMORE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 321 | ANNAPOLIS | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 322 | TOWSON | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 323 | SHARPTOWN | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 324 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 325 | ELLICOTTCY | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 326 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 327 | ABERDEEN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 328 | SYKESVILLE | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 329 | WATERLO236 | District of Columbia | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 330 | COCKEYSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 331 | TANEYTOWN | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 332 | CROFTON | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 333 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 334 | PIKESVILLE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 335 | BRYNPKLNCM | Maryland | XO MARYLAND, LLC | CLEC | More |
| 443 | 336 | ANNAPOLIS | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 337 | SPARROWSPT | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 338 | SPARKSGLNC | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 339 | SHERWD FOR | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 340 | WESTMINSTR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 341 | CATONSVL | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 342 | SOLOMONS | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 343 | MILLERSVL | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 344 | SEVERNA PK | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 345 | ABERDEEN | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 346 | SEVERNA PK | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 347 | CARDIFF | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 348 | WOODLAWN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 349 | SILVER RUN | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 350 | ELKTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 351 | ODENTON | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 352 | PIKESVILLE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 353 | COCKEYSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 354 | GLENBURNIE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 355 | ELLICOTTCY | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 356 | BEL AIR | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 357 | PIKESVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 358 | NORTH EAST | Maryland | YMAX COMMUNICATIONS CORP. - MD | | More |
| 443 | 359 | DELMAR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 360 | ABERDEEN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 361 | SYKESVILLE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 362 | EASTON | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 363 | SEVERN | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 364 | ELLICOTTCY | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 365 | SALISBURY | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 366 | SALISBURY | Maryland | METROPCS, INC. | | More |
| 443 | 367 | COLUMBIA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 368 | WESTMINSTR | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 369 | BEL AIR | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 370 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 371 | BEL AIR | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 372 | EDGEWOOD | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 373 | OCEAN CITY | Maryland | METROPCS, INC. | | More |
| 443 | 374 | ABERDEEN | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 375 | HAMPSTEAD | Maryland | METROPCS, INC. | | More |
| 443 | 376 | DUNDALK | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 377 | ANNAPOLIS | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 378 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 379 | PIKESVILLE | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 380 | WOODLAWN | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 381 | REISTERSTN | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 382 | CAMBRIDGE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 383 | SILVER RUN | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 384 | PARKVILLE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 385 | EASTON | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 386 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 387 | POCOMOKE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 388 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 389 | SALISBURY | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 390 | CHURCHVL | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 391 | COCKEYSVL | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 392 | BALTIMORE | Maryland | AT&T - LOCAL | CLEC | More |
| 443 | 393 | COLUMBIA | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 394 | PIKESVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 395 | CHASE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 396 | ODENTON | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 397 | CARDIFF | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 398 | SYKESVILLE | Maryland | METROPCS, INC. | | More |
| 443 | 399 | DUNDALK | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 400 | BRYNPKLNCM | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 401 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 402 | EDGEWOOD | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 403 | ABERDEEN | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 404 | SOLOMONS | Maryland | METROPCS, INC. | | More |
| 443 | 405 | RANDALLSTN | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 406 | ELKTON | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 407 | DUNDALK | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 408 | SPARROWSPT | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 409 | EDGEWOOD | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 410 | BALTIMORE | Maryland | CENTURYLINK COMMUNICATIONS, LLC | | More |
| 443 | 412 | CHURCHVL | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 413 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 414 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 415 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 416 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 417 | FALLSTON | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 418 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 419 | GLENWOOD | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 420 | ELLICOTTCY | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 421 | FORK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 422 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 423 | BALTIMORE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 424 | CARDIFF | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 425 | PARKVILLE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 426 | RANDALLSTN | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 427 | PRINCEANNE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 428 | COCKEYSVL | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 429 | WOODLAWN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 430 | COLUMBIA | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 431 | RANDALLSTN | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 432 | PRINCEFRCK | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 433 | ANNAPOLIS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 434 | FEDERALSBG | Maryland | TELNYX LLC | | More |
| 443 | 435 | ESSEX | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 436 | WOODLAWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 437 | POCOMOKE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 438 | PIKESVILLE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 439 | TRAPPE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 440 | ANNAPOLIS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 441 | GLENWOOD | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 442 | PARKVILLE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 443 | ARBUTUS | Maryland | COMMIO, LLC | | More |
| 443 | 444 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 445 | ELKRIDGE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 446 | QUEENSTOWN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 447 | PIKESVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 448 | DENTON | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 449 | BALTIMORE | Maryland | BROADVIEW NETWORKS, INC. - MD | | More |
| 443 | 450 | PIKESVILLE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 451 | BALTIMORE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 452 | BALTIMORE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 453 | WATERLOO | Maryland | ONVOY, LLC - MD | | More |
| 443 | 454 | ANNAPOLIS | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 455 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 456 | EDGEWOOD | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 457 | BRYNPKLNCM | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 458 | ANNAPOLIS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 459 | ELKRIDGE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 460 | ESSEX | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 461 | PARKVILLE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 462 | SEVERN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 463 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 464 | BEL AIR | Maryland | BROADVIEW NETWORKS, INC. - MD | | More |
| 443 | 465 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 466 | ELKTON | Maryland | METROPCS, INC. | | More |
| 443 | 467 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 468 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 469 | COLUMBIA | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 470 | TOWSON | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 471 | PIKESVILLE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 472 | COLUMBIA | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 473 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 474 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 475 | SEVERN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 476 | ANNAPOLIS | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 477 | CAMBRIDGE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 478 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 479 | WATERLO236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 480 | SALISBURY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 481 | ANNAPOLIS | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 482 | ANNAPOLIS | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 483 | CARDIFF | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 484 | EDGEWOOD | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 485 | ELKTON | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 486 | PRINCEFRCK | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 487 | WESTMINSTR | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 488 | COLUMBIA | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 489 | CHASE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 490 | EDGEWOOD | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 491 | PARKTON | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 492 | ELKRIDGE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 493 | SEVERNA PARK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 494 | MILLERSVL | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 495 | PARKVILLE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 496 | EASTON | Maryland | METROPCS, INC. | | More |
| 443 | 497 | SALISBURY | Maryland | METROPCS, INC. | | More |
| 443 | 498 | CATONSVL | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 499 | JARRETTSVL | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 500 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 501 | PIKESVILLE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 502 | HAVREGRACE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 503 | DUNDALK | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 504 | FALLSTON | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 505 | ESSEX | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 506 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 507 | HAMPSTEAD | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 508 | HAMPSTEAD | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 509 | COCKEYSVILLE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 510 | ELKTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 512 | EDGEWOOD | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 513 | BERLIN | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 514 | CATONSVL | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 515 | ARBUTUS | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 516 | SYKESVILLE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 517 | GLENBURNIE | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 518 | SYKESVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 519 | TOWSON | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 520 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 521 | CAMBRIDGE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 522 | REISTERSTN | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 523 | SALISBURY | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 524 | BALTIMORE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 525 | BEL AIR | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 526 | HAVREGRACE | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 527 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 528 | BEL AIR | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 529 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 530 | DUNDALK | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 531 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 532 | PRINCEFRCK | Maryland | METROPCS, INC. | | More |
| 443 | 533 | JARRETTSVL | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 534 | ANNAPOLIS | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 535 | COLUMBIA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 536 | WESTMINSTR | Maryland | METROPCS, INC. | | More |
| 443 | 537 | REISTERSTOWN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 538 | COLUMBIA | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 539 | COLUMBIA | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 540 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 541 | COCKEYSVL | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 542 | COLUMBIA | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 543 | ARBUTUS | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 544 | PIKESVILLE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 545 | COLUMBIA | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 546 | COLUMBIA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 547 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 548 | PIKESVILLE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 549 | DUNDALK | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 550 | NORTHBEACH | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 551 | WOODLAWN | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 552 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 553 | ELKTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 554 | CHASE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 555 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 556 | COCKEYSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 557 | GLENBURNIE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 558 | ABERDEEN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 559 | ESSEX | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 560 | ESSEX | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 561 | ELKRIDGE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 562 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 563 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 564 | TOWSON | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 565 | RANDALLSTN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 566 | CHESAPKECY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 567 | BEL AIR | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 568 | ARBUTUS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 569 | ANNAPOLIS | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 570 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 571 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 572 | GLENBURNIE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 573 | BALTIMORE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 574 | ELLICOTTCY | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 575 | ARBUTUS | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 576 | RANDALLSTN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 577 | GLENBURNIE | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 578 | COCKEYSVL | Maryland | XO MARYLAND, LLC | CLEC | More |
| 443 | 579 | ESSEX | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 580 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 581 | CHASE | Maryland | ONVOY, LLC - MD | | More |
| 443 | 582 | CHURCHVL | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 583 | COLUMBIA | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 584 | CROFTON | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 585 | DARLINGTON | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 586 | DUNDALK | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 587 | EDGEWOOD | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 588 | PARKVILLE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 589 | COCKEYSVL | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 590 | REISTERSTN | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 591 | COCKEYSVL | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 592 | ELKRIDGE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 593 | ELKTON | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 594 | SPARROWSPT | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 595 | SPARKSGLNC | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 596 | ESSEX | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 597 | SEVERNA PK | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 598 | SHERWD FOR | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 599 | SEVERN | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 600 | ESSEX | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 601 | FALLSTON | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 602 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 603 | ANNAPOLIS | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 604 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 605 | WESTMINSTR | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 606 | FORK | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 607 | WEST RIVER | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 608 | TOWSON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 609 | SYKESVILLE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 610 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 612 | CATONSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 613 | TOWSON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 614 | SALISBURY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 615 | RANDALLSTOWN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 616 | BEL AIR | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 617 | FALLSTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 618 | GLENBURNIE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 619 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 620 | WATERLO238 | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 621 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 622 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 623 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 624 | PRINCEFRCK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 625 | FORK | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 626 | CHASE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 627 | BALTIMORE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 628 | GLENBURNIE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 629 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 630 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 631 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 632 | TOWSON | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 633 | WATERLO238 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 634 | BALTIMORE | Virginia | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 635 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 636 | CATONSVL | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 637 | ARGRGBSNIS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 638 | ELLICOTTCY | Maryland | GLOBAL NAPS SOUTH, INC. - MD | CLEC | More |
| 443 | 639 | HAMPSTEAD | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 640 | BEL AIR | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 641 | PIKESVILLE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 642 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 643 | BEL AIR | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 644 | JARRETTSVL | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 645 | MILLERSVL | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 646 | NORTHBEACH | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 647 | NEWWINDSOR | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 648 | ESSEX | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 649 | SPARROWSPT | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 650 | REISTERSTN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 651 | FORK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 652 | TOWSON | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 653 | PARKVILLE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 654 | SEVERNA PARK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 655 | BEL AIR | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 656 | COLUMBIA | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 657 | RANDALLSTN | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 443 | 658 | WOODLAWN | Maryland | ONVOY, LLC - MD | | More |
| 443 | 659 | WEST RIVER | Maryland | ONVOY, LLC - MD | | More |
| 443 | 660 | PIKESVILLE | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 661 | WATERLO238 | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 662 | SPARKSGLNC | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 663 | WOODLAWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 664 | OCEAN CITY | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 665 | NANTICOKE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 666 | PT DEPOSIT | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 667 | DELMAR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 668 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 669 | DELMAR | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 670 | CATONSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 671 | NEWWINDSOR | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 672 | PARKTON | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 673 | BRYNPKLNCM | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 674 | NORTH EAST | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 675 | RANDALLSTN | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 676 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 677 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 678 | PARKVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 679 | SEVERN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 680 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 681 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 682 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 683 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 684 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 685 | SEVERN | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 686 | FALLSTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 687 | WOODLAWN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 688 | SEVERN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 689 | COCKEYSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 690 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 691 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 692 | BALTIMORE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 693 | PERRYVILLE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 694 | SEVERNA PK | Maryland | METROPCS, INC. | | More |
| 443 | 695 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 696 | DUNDALK | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 697 | CATONSVL | Maryland | GLOBAL NAPS SOUTH, INC. - MD | CLEC | More |
| 443 | 698 | ODENTON | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 699 | PIKESVILLE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 701 | ARBUTUS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 702 | ARGRGBSNIS | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 703 | BALTIMORE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 704 | ODENTON | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 705 | COCKEYSVL | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 706 | CRISFIELD | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 707 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 708 | BALTIMORE | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 443 | 709 | ARBUTUS | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 710 | CATONSVL | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 712 | REISTERSTN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 713 | BALTIMORE | Maryland | PEERLESS NETWORK OF MARYLAND, LLC | | More |
| 443 | 714 | COLUMBIA | Virginia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 715 | NORTH EAST | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 716 | ANNAPOLIS | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 717 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 718 | COLUMBIA | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 719 | JARRETTSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 720 | ELKTON | Virginia | XO MARYLAND, LLC | CLEC | More |
| 443 | 721 | SHERWOOD FOREST | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 722 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 723 | BRYNPKLNCM | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 724 | EASTON | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 725 | PARKVILLE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 726 | TOWSON | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 727 | BISHOPVL | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 728 | BERLIN | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 729 | WOODLAWN | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 730 | ESSEX | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 731 | PT DEPOSIT | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 732 | SILVER RUN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 733 | WATERLO238 | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 734 | SEVERN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 735 | SALISBURY | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 736 | SALISBURY | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 737 | WATERLO238 | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 738 | PIKESVILLE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 739 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 740 | BALTIMORE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 741 | PIKESVILLE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 742 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 743 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 744 | REISTERSTN | Maryland | METROPCS, INC. | | More |
| 443 | 745 | COLUMBIA | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 746 | EASTON | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 747 | PT DEPOSIT | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 748 | MILLERSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 749 | GLENBURNIE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 750 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 751 | WOODLAWN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 752 | BEL AIR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 753 | WATERLO236 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 754 | ELLICOTT CITY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 755 | WATERLO238 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 756 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 757 | ELKRIDGE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 758 | ANNAPOLIS | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 759 | RANDALLSTOWN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 760 | ABERDEEN | Maryland | AT&T - LOCAL | CLEC | More |
| 443 | 761 | WOODLAWN | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 762 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 763 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 764 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 765 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 766 | COLUMBIA | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 767 | WORTHINGTN | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 768 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 769 | ARBUTUS | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 770 | ARGRGBSNIS | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 771 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 772 | ESSEX | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 773 | BRYNPKLNCM | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 774 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 775 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 776 | BALTIMORE | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 443 | 777 | ESSEX | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 778 | WATERLO236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 779 | ABERDEEN | Maryland | XO MARYLAND, LLC | CLEC | More |
| 443 | 780 | WOODLAWN | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 781 | ARGRGBSNIS | Maryland | ONVOY, LLC - MD | | More |
| 443 | 782 | ANNAPOLIS | Maryland | XO MARYLAND, LLC | CLEC | More |
| 443 | 783 | SALISBURY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 784 | ARGRGBSNIS | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 785 | ARBUTUS | Maryland | ONVOY, LLC - MD | | More |
| 443 | 786 | EASTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 787 | BEL AIR | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 788 | ABERDEEN | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 789 | WESTMINSTR | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 790 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 791 | TOWSON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 792 | BRYNPKLNCM | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 793 | PARKVILLE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 794 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 795 | SEVERN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 796 | PIKESVILLE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 797 | TOWSON | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 798 | TOWSON | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 443 | 799 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 800 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 801 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 802 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 803 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 804 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 805 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 806 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 807 | FALLSTON | Maryland | METROPCS, INC. | | More |
| 443 | 808 | BALTIMORE | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 443 | 809 | BALTIMORE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 810 | ESSEX | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 812 | COLUMBIA | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 813 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 814 | WESTMINSTER | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 815 | ESSEX | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 816 | SEVERNA PK | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 817 | ARGRGBSNIS | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 818 | ARGRGBSNIS | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 819 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 820 | ELKRIDGE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 821 | BEL AIR | Maryland | METROPCS, INC. | | More |
| 443 | 822 | ANNAPOLIS | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 823 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 824 | TOWSON | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 825 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 826 | OCEAN CITY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 827 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 828 | ELLICOTTCY | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 829 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 830 | CATONSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 831 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 832 | COLUMBIA | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 833 | ARBUTUS | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 834 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 835 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 836 | BALTIMORE | Maryland | XO MARYLAND, LLC | CLEC | More |
| 443 | 837 | ANNAPOLIS | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 838 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 839 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 840 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 841 | TOWSON | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 842 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 843 | HAVREGRACE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 844 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 845 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 846 | TOWSON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 847 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 848 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 849 | TOWSON | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 850 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 851 | CATONSVL | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 852 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 853 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 854 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 855 | ABERDEEN | Maryland | LIGHTWAVE COMMUNICATIONS, LLC - MD | | More |
| 443 | 856 | OCEAN CITY | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 857 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 858 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 859 | SALISBURY | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 860 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 861 | SPARKS GLENCOE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 862 | DUNDALK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 863 | EDGEWOOD | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 864 | COLUMBIA | Maryland | METROPCS, INC. | | More |
| 443 | 865 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 866 | BEL AIR | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 867 | GLENBURNIE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 868 | ESSEX | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 869 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 870 | PIKESVILLE | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 443 | 871 | ANNAPOLIS | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 872 | BALTIMORE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 873 | LAUREL | Maryland | ONVOY, LLC - MD | | More |
| 443 | 874 | BALTIMORE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 875 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 876 | BEL AIR | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 877 | NORTH EAST | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 878 | COLUMBIA | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 879 | DUNDALK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 880 | SALISBURY | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 881 | REISTERSTN | Maryland | METROPCS, INC. | | More |
| 443 | 882 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 883 | GLENBURNIE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 884 | BALTIMORE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 885 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 886 | COCKEYSVL | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 887 | CATONSVL | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 888 | PRINCEANNE | Maryland | CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD | CLEC | More |
| 443 | 889 | GLENBURNIE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 890 | COLUMBIA | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 891 | GLENBURNIE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 892 | NEWWINDSOR | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 443 | 893 | WOODLAWN | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 894 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 895 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 896 | COLUMBIA | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 897 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 898 | PIKESVILLE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 899 | WATERLO238 | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 900 | TOWSON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 901 | TOWSON | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 902 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 903 | BEL AIR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 904 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 905 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 906 | SEVERNA PK | Maryland | PEERLESS NETWORK OF MARYLAND, LLC | | More |
| 443 | 907 | ELKTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 908 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 909 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 910 | BEL AIR | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 912 | TOWSON | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 913 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 914 | WORTHINGTN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 915 | CROFTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 916 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 917 | SILVER RUN | Maryland | ONVOY, LLC - MD | | More |
| 443 | 918 | TANEYTOWN | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 919 | BALTIMORE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 920 | SYKESVILLE | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 921 | TOWSON | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 922 | EDGEWOOD | Maryland | ATX TELECOMMUNICATIONS SERVICES, LTD. | | More |
| 443 | 923 | BALTIMORE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 924 | ANNAPOLIS | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 925 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 926 | ANNAPOLIS | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 927 | BALTIMORE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 928 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 929 | PIKESVILLE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 930 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 931 | BALTIMORE | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 443 | 932 | SEVERNA PARK | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 933 | COCKEYSVL | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 934 | FORK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 935 | TOWSON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 936 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 937 | UNION BDG | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 938 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 939 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 940 | PIKESVILLE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 941 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 942 | SEVERNA PK | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 943 | SPARROWSPT | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 944 | SALISBURY | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 945 | ELKTON | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 946 | PARKVILLE | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 443 | 947 | PERRYVILLE | Maryland | CTC COMMUNICATIONS CORP. - MD | CLEC | More |
| 443 | 948 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 949 | ANNAPOLIS | Maryland | COMCAST IP PHONE, LLC | | More |
| 443 | 951 | ANNAPOLIS | Maryland | GLOBAL CROSSING LOCAL SERVICES, INC. - MD | CLEC | More |
| 443 | 952 | WESTMINSTR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 953 | FALLSTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 954 | BALTIMORE | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 443 | 955 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 956 | BALTIMORE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 957 | BALTIMORE | Maryland | AT&T - LOCAL | CLEC | More |
| 443 | 960 | GLENBURNIE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 961 | PRINCEFRCK | Maryland | INTRADO COMMUNICATIONS, LLC | | More |
| 443 | 962 | GLENBURNIE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 963 | BALTIMORE | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 443 | 964 | NORTHBEACH | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 965 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 966 | FALLSTON | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 967 | NORTH EAST | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 968 | PRINCEFRCK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 969 | ESSEX | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 970 | PERRYVILLE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 971 | COCKEYSVL | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 443 | 972 | ESSEX | Maryland | US LEC OF MARYLAND, INC. | CLEC | More |
| 443 | 973 | ELLICOTTCY | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 443 | 974 | WESTMINSTR | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 443 | 975 | PRINCEFRCK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 976 | CROFTON | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 443 | 977 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 978 | SALISBURY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 979 | COLUMBIA | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 980 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 981 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 982 | BALTIMORE | Maryland | YMAX COMMUNICATIONS CORP. - MD | | More |
| 443 | 983 | BALTIMORE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 984 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 985 | RANDALLSTN | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 443 | 986 | BALTIMORE | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 987 | BEL AIR | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 988 | CENTREVL | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 989 | GLENBURNIE | Maryland | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 443 | 990 | COCKEYSVILLE | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 443 | 991 | ELLICOTT CITY | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 443 | 992 | BALTIMORE | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 443 | 993 | DUNDALK | Maryland | METROPCS, INC. | | More |
| 443 | 994 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 995 | ANNAPOLIS | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 996 | CATONSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 443 | 997 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 998 | PARKVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 443 | 999 | BALTIMORE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
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