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