Area
Code | Prefix | City/Switch Name
(Click for city search) | State/Prov.
Area Map | Telephone Company
Web link | Telco
Type | More
Info |
|---|
| 301 | 200 | BRANDYWINE | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 201 | WSNGTNZN10 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 202 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 203 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 204 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 205 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 206 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 207 | WSNG236Z13 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 208 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 209 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 210 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 212 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 213 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 214 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 215 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 216 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 217 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 218 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 219 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 220 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 221 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 222 | WSHNGTNZN2 | District of Columbia | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 301 | 223 | WILLIAMSPT | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 224 | WSHNGTNZN2 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 225 | WSNG236Z13 | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 226 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 227 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 228 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 229 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 230 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 231 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 232 | ASHTON236 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 233 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 234 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 235 | WSNGTNZN16 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 236 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 237 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 238 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 239 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 240 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 241 | HIGHFIELD | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 242 | BRANDYWINE | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 243 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 244 | WSHNGTNZN3 | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 245 | BITTINGER | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 246 | NANJEMOY | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 247 | LEONARDTN | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 248 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 249 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 250 | GAITHERSBG | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 251 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 252 | GAITHERSBG | Maryland | METROPCS, INC. | | More |
| 301 | 253 | DAMASCS236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 254 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 255 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 256 | LAUREL236 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 257 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 258 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 259 | TOMPKINSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 260 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 261 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 262 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 263 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 264 | MT SAVAGE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 265 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 266 | WALDORF | District of Columbia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 267 | WSNG236Z13 | District of Columbia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 268 | CUMBERLAND | Maryland | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | WIRELESS PROV | More |
| 301 | 269 | DAMASCS236 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 270 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 271 | THURMONT | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 272 | WSHNGTNZN2 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 273 | WSHNGTNZN3 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 274 | HUGHESVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 275 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 276 | WSHNGTNZN4 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 277 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 278 | WSHNGTNZN5 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 279 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 280 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 281 | WSHNGTNZN6 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 282 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 283 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 284 | WSNGTNZN10 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 285 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 286 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 287 | WSNGTNZN11 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 288 | WSNGTNZN12 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 289 | WSNG236Z13 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 290 | MECHANCSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 291 | WSNG236Z14 | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 292 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 293 | MYERSVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 294 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 295 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 296 | WSNGTNZN10 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 297 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 298 | WSNGTNZN15 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 299 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 300 | WSHNGTNZN2 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 301 | GAITHERSBG | Maryland | ONVOY, LLC - MD | | More |
| 301 | 302 | HAGERSTOWN | Maryland | METROPCS, INC. | | More |
| 301 | 303 | WSNG236Z13 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 304 | WALKERSVL | Maryland | COMCAST IP PHONE, LLC | | More |
| 301 | 305 | FREDERICK | Maryland | METROPCS, INC. | | More |
| 301 | 306 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 307 | WSNG238Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 308 | WSNG236Z13 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 309 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 310 | LAUREL238 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 312 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 313 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 314 | WSHNGTNZN4 | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 315 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 316 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 317 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 318 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 319 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 320 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 321 | WSNGTNZN11 | Maryland | ONVOY, LLC - MD | | More |
| 301 | 322 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 323 | LAUREL236 | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 301 | 324 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 325 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 326 | WSHNGTNZN3 | District of Columbia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 327 | WSNG238Z15 | District of Columbia | COMCAST IP PHONE, LLC | | More |
| 301 | 328 | WSHNGTNZN3 | District of Columbia | COMCAST IP PHONE, LLC | | More |
| 301 | 329 | WSNG236Z13 | District of Columbia | ONVOY, LLC - MD | | More |
| 301 | 330 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 331 | HAGERSTOWN | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 332 | WSHNGTNZN3 | District of Columbia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 333 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 334 | OAKLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 335 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 336 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 337 | GAITHERSBG | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 338 | CUMBERLAND | District of Columbia | IDT AMERICA, CORP. - MD | | More |
| 301 | 339 | WSNGTNZN10 | District of Columbia | CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD | | More |
| 301 | 340 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 341 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 342 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 343 | WSHNGTNZN5 | Maryland | METROPCS, INC. | | More |
| 301 | 344 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 345 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 346 | WSHNGTNZN3 | District of Columbia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 347 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 348 | WSNGTNZN11 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 349 | POOLESVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 350 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 351 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 352 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 353 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 354 | WSNGTNZN10 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 355 | GAITHERSBG | District of Columbia | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 356 | LAUREL236 | District of Columbia | VDL, INC. DBA GLOBAL TELECOM BROKERS - MD | | More |
| 301 | 357 | WSHNGTNZN3 | District of Columbia | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 358 | WSNGTNZN15 | District of Columbia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 359 | WESTERNPT | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 360 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 361 | WSHNGTNZN4 | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 301 | 362 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 363 | DAMASCS240 | District of Columbia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 364 | WSHNGTNZN4 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 365 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 366 | GAITHERSBG | District of Columbia | METROPCS, INC. | | More |
| 301 | 367 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 368 | DAMASCS236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 369 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 370 | GAITHERSBG | Maryland | METROPCS, INC. | | More |
| 301 | 371 | MIDDLETOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 372 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 373 | LEONARDTN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 374 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 375 | INDIANHEAD | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 376 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 377 | LAUREL236 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 378 | FREDERICK | District of Columbia | COMCAST IP PHONE, LLC | | More |
| 301 | 379 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 380 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 381 | WSHNGTNZN2 | Maryland | ONVOY, LLC - MD | | More |
| 301 | 382 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 383 | WSNG236Z14 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 384 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 385 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 386 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 387 | OAKLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 388 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 389 | WSNG236Z13 | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 301 | 390 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 391 | DAMASCS236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 392 | LA PLATA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 393 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 394 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 395 | LAUREL238 | District of Columbia | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 396 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 397 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 398 | WSNGTNZN10 | District of Columbia | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 399 | WALDORF | Maryland | METROPCS, INC. | | More |
| 301 | 400 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 401 | FREDERICK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 402 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 403 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 404 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 405 | WSHNGTNZN4 | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 406 | WSHNGTNZN2 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 407 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 408 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 409 | WSNG236Z13 | District of Columbia | ONVOY SPECTRUM, LLC | | More |
| 301 | 410 | WSHNGTNZN6 | Maryland | ONVOY SPECTRUM, LLC | | More |
| 301 | 412 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 413 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 414 | DAMASCS236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 415 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 416 | MYERSVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 417 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 418 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 419 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 420 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 421 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 422 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 423 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 424 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 425 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 426 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 427 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 428 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 429 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 430 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 431 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 432 | KEEDYSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 433 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 434 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 435 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 436 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 437 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 438 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 439 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 440 | WSHNGTNZN5 | Maryland | METROPCS, INC. | | More |
| 301 | 441 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 442 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 443 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 444 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 445 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 446 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 447 | EMMITSBURG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 448 | WSHNGTNZN3 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 449 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 450 | WSHNGTNZN3 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 451 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 452 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 453 | KITZMILLER | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 454 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 455 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 456 | WSHNGTNZN5 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 457 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 458 | WSHNGTNZN4 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 459 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 460 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 461 | WSNGTNZN10 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 462 | MYERSVILLE | Maryland | METROPCS, INC. | | More |
| 301 | 463 | LONACONING | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 464 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 465 | MYERSVILLE | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 466 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 467 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 468 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 469 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 470 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 471 | FREDERICK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 472 | MECHANCSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 473 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 474 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 475 | LEONARDTN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 476 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 477 | WSNG236Z13 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 478 | FLINTSTONE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 479 | WSNG236Z13 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 480 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 481 | LEONARDTN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 482 | DAMASCS236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 483 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 484 | WSHNGTNZN4 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 485 | WSHNGTNZN6 | Virginia | COMCAST IP PHONE, LLC | | More |
| 301 | 486 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 487 | MYERSVILLE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 488 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 489 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 490 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 491 | HAGERSTOWN | Maryland | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | WIRELESS PROV | More |
| 301 | 492 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 493 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 494 | WSNG238Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 495 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 496 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 497 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 498 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 499 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 500 | SANTA MONICA | California | XO MARYLAND, LLC | CLEC | More |
| 301 | 501 | OAKLAND | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 502 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 503 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 504 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 505 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 506 | WSNG236Z13 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 507 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 508 | MYERSVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 509 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 510 | WSNG236Z13 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 512 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 513 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 514 | FREDERICK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 515 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 516 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 517 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 518 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 519 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 520 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 521 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 522 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 523 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 524 | FREDERICK | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 525 | GAITHERSBG | Maryland | QUANTUM TELECOMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 526 | WSHNGTNZN3 | District of Columbia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 527 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 528 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 529 | WSNGTNZN10 | District of Columbia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 530 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 531 | WSHNGTNZN4 | Maryland | STARPOWER COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 532 | WSHNGTNZN4 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 533 | OAKLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 534 | INDIANHEAD | Maryland | YMAX COMMUNICATIONS CORP. - MD | | More |
| 301 | 535 | WALDORF | District of Columbia | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 536 | LEONARDTN | Maryland | METROPCS, INC. | | More |
| 301 | 537 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 538 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 539 | LA PLATA | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 540 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 541 | WSHNGTNZN5 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 542 | WALDORF | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 543 | LAUREL236 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 544 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 545 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 546 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 547 | WSHNGTNZN2 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 548 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 549 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 550 | WSNGTNZN10 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 551 | WSHNGTNZN3 | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 301 | 552 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 553 | WALDORF | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 554 | WSHNGTNZN2 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 555 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 556 | GAITHERSBG | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 557 | MECHANCSVL | District of Columbia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 558 | WSNG236Z13 | District of Columbia | USA MOBILITY WIRELESS, INC. | WIRELESS PROV | More |
| 301 | 559 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 560 | WSHNGTNZN4 | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 561 | WSHNGTNZN3 | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 301 | 562 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 563 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 564 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 565 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 566 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 567 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 568 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 569 | GAITHERSBG | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 570 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 571 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 572 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 573 | HAGERSTOWN | Maryland | METROPCS, INC. | | More |
| 301 | 574 | WSNG236Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 575 | LAUREL236 | Virginia | US LEC OF MARYLAND, INC. | CLEC | More |
| 301 | 576 | WSHNGTNZN3 | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 577 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 578 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 579 | BRANDYWINE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 580 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 581 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 582 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 583 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 584 | WSHNGTNZN2 | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 301 | 585 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 586 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 587 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 588 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 589 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 590 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 591 | GAITHERSBG | Maryland | PAETEC COMMUNICATIONS, INC. - MD | CLEC | More |
| 301 | 592 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 593 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 594 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 595 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 596 | LAUREL238 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 597 | HANCOCK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 598 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 599 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 600 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 601 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 602 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 603 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 604 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 605 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 606 | FREDERICK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 607 | DAMASCS240 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 608 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 609 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 610 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 612 | ASHTON236 | Virginia | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 301 | 613 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 614 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 615 | WSNG236Z13 | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 616 | OAKLAND | Maryland | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | WIRELESS PROV | More |
| 301 | 617 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 618 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 619 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 620 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 621 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 622 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 623 | WSNG236Z13 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 624 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 625 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 626 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 627 | WSNG236Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 628 | WSHNGTNZN3 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 629 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 630 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 631 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 632 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 633 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 634 | WSHNGTNZN2 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 635 | MYERSVILLE | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 636 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 637 | WSNGTNZN10 | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 638 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 639 | FREDERICK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 640 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 641 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 642 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 643 | WALDORF | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 644 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 645 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 646 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 647 | WSNG236Z13 | Maryland | AMERICAN MESSAGING SERVICES, LLC | | More |
| 301 | 648 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 649 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 650 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 651 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 652 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 653 | WALDORF | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 654 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 655 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 656 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 657 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 658 | ASHTON236 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 659 | WALDORF | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 660 | KEEDYSVL | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 661 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 662 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 663 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 664 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 665 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 666 | WSNG236Z14 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 667 | MYERSVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 668 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 669 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 670 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 671 | HAGERSTOWN | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 672 | LXTNPKGRML | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 673 | FREDERICK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 674 | WSHNGTNZN2 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 675 | WSHNGTNZN3 | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 676 | FREDERICK | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 677 | WSNG236Z14 | Maryland | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 678 | HANCOCK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 679 | WSNGTNZN12 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 680 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 681 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 682 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 683 | WSHNGTNZN4 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 684 | INDIANHEAD | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 685 | DAMASCS236 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 686 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 687 | FROSTBURG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 688 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 689 | FROSTBURG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 690 | LEONARDTN | Maryland | IDT AMERICA, CORP. - MD | | More |
| 301 | 691 | POOLESVL | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 692 | WSNGTNZN11 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 693 | HAGERSTOWN | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 694 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 695 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 696 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 697 | CUMBERLAND | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 698 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 699 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 701 | WSNG236Z13 | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 702 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 703 | MOUNT AIRY | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 704 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 705 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 706 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 707 | CUMBERLAND | Maryland | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | WIRELESS PROV | More |
| 301 | 708 | WSNG236Z13 | District of Columbia | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 709 | WSNG236Z13 | District of Columbia | CSC WIRELESS, LLC | | More |
| 301 | 710 | WALDORF | Maryland | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 712 | FREDERICK | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 301 | 713 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 714 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 715 | WSNGTNZN15 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 716 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 717 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 718 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 719 | WSNGTNZN16 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 720 | BRANDYWINE | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 721 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 722 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 723 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 724 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 725 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 726 | KITZMILLER | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 301 | 727 | WSHNGTNZN5 | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 301 | 728 | WSHNGTNZN3 | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 729 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 730 | MYERSVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 731 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 732 | WSNG236Z13 | District of Columbia | METROPCS, INC. | | More |
| 301 | 733 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 734 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 735 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 736 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 737 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 738 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 739 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 740 | GAITHERSBG | District of Columbia | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 741 | LAUREL236 | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 742 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 743 | INDIANHEAD | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 744 | INDIANHEAD | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 745 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 746 | FRIENDSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 747 | WSHNGTNZN6 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 748 | FREDERICK | Maryland | METROPCS, INC. | | More |
| 301 | 749 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 750 | FRIENDSVL | District of Columbia | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 301 | 751 | WALDORF | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 752 | WALDORF | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 753 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 754 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 755 | WSHNGTNZN3 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 756 | WSNG236Z14 | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 301 | 757 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 758 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 759 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 760 | WSHNGTNZN2 | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 761 | WSNGTNZN11 | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 762 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 763 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 764 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 765 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 766 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 767 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 768 | WSHNGTNZN3 | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 769 | LEONARDTN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 770 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 771 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 772 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 773 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 774 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 775 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 776 | LAUREL236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 777 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 778 | WSHNGTNZN5 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 779 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 780 | WSNG236Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 781 | FROSTBURG | Maryland | ONVOY SPECTRUM, LLC | | More |
| 301 | 782 | BRANDYWINE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 783 | CUMBERLAND | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 784 | CUMBERLAND | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 785 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 786 | MCCOOLE | West Virginia | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 787 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 788 | FREDERICK | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 789 | WSHNGTNZN4 | Maryland | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 301 | 790 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 791 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 792 | WSHNGTNZN3 | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 793 | WSHNGTNZN3 | Virginia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 794 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 795 | WSNGTNZN10 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 796 | WSNG236Z13 | District of Columbia | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 797 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 798 | DAMASCS240 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 799 | KEEDYSVL | District of Columbia | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 301 | 800 | HAGERSTOWN | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 801 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 802 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 803 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 804 | ASHTON236 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 805 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 806 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 807 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 808 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 809 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 810 | BUCKEYSTN | Maryland | ONVOY SPECTRUM, LLC | | More |
| 301 | 812 | WSNG238Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 813 | WSHNGTNZN2 | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 301 | 814 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 815 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 816 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 817 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 818 | WALDORF | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 819 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 820 | GAITHERSBG | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 821 | LAUREL236 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 822 | WSNGTNZN11 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 823 | WSNG236Z13 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 824 | SMITHSBURG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 825 | WSNGTNZN10 | District of Columbia | AT&T - LOCAL | CLEC | More |
| 301 | 826 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 827 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 828 | WSHNGTNZN2 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 829 | MOUNT AIRY | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 830 | WSHNGTNZN3 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - MD | CAP | More |
| 301 | 831 | DAMASCS240 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 832 | WSHNGTNZN4 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 833 | WSNG236Z14 | District of Columbia | TELEPORT COMMUNICATIONS AMERICA, LLC - DC | CLEC | More |
| 301 | 834 | BRUNSWICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 835 | HAGERSTOWN | Maryland | VONAGE AMERICA LLC | | More |
| 301 | 836 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 837 | WSNG236Z13 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 838 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 839 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 840 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 841 | WSHNGTNZN2 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 842 | CLEAR SPG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 843 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 844 | WSHNGTNZN4 | District of Columbia | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 845 | WALKERSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 846 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 847 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 848 | WALDORF | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 849 | OAKLAND | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 850 | WSNGTNZN14 | District of Columbia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 851 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 852 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 853 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 854 | ASHTON238 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 855 | WSNG238Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 856 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 857 | CLEAR SPG | District of Columbia | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 301 | 858 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 859 | OAKLAND | District of Columbia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 860 | WSNG236Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 861 | WALDORF | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 862 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 863 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 864 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 865 | NEW MARKET | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 866 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 867 | WSNGTNZN14 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 868 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 869 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 870 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 871 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 872 | RIDGE | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 873 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 874 | BUCKEYSTN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 875 | LAUREL236 | District of Columbia | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 876 | CUMBERLAND | District of Columbia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 877 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 878 | | Maryland | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD | CLEC | More |
| 301 | 879 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 880 | LXTNPKGRML | Virginia | LEVEL 3 COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 881 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 882 | NEW MARKET | District of Columbia | CORE COMMUNICATIONS, INC.- MD | CLEC | More |
| 301 | 883 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 884 | MECHANCSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 885 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 886 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 887 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 888 | WSNGTNZN16 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 889 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 890 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 891 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 892 | WSHNGTNZN4 | District of Columbia | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 893 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 894 | WSHNGTNZN6 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 895 | GRANTSVL | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 896 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 897 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 898 | FREDERICK | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 899 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 900 | WSHNGTNZN2 | Maryland | ONVOY, LLC - MD | | More |
| 301 | 901 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 902 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 903 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 904 | LEONARDTN | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 905 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 906 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 907 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 908 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 909 | WSHNGTNZN5 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 910 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 912 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 913 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 914 | WSNG236Z13 | District of Columbia | MOUNTAIN COMMUNICATIONS, LLC DBA PROCOM - MD | | More |
| 301 | 915 | WSHNGTNZN2 | Maryland | STARPOWER COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 916 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 917 | WSNGTNZN10 | Maryland | STARPOWER COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 918 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 919 | WSHNGTNZN2 | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 920 | WSHNGTNZN3 | Maryland | STARPOWER COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 921 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 922 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 923 | WSNG236Z13 | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 924 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 925 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 926 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 927 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 928 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 929 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 930 | WSHNGTNZN3 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 931 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 932 | WALDORF | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 933 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 934 | LA PLATA | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 935 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 936 | WSHNGTNZN4 | District of Columbia | TELNYX LLC | | More |
| 301 | 937 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 938 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 939 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 940 | ASHTON236 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 941 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 942 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 943 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 944 | GAITHERSBG | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 945 | WSNGTNZN11 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 946 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 947 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 948 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 949 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 951 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 952 | WSNG236Z15 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 953 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 954 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 955 | WSHNGTNZN4 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 956 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 957 | LAUREL236 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 960 | WSHNGTNZN3 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 961 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 962 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 963 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 964 | MYERSVILLE | Maryland | NEW CINGULAR WIRELESS PCS, LLC - DC | WIRELESS PROV | More |
| 301 | 965 | WSHNGTNZN6 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 966 | WSNGTNZN12 | District of Columbia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 967 | WSHNGTNZN5 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 968 | WSHNGTNZN2 | Virginia | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | CLEC | More |
| 301 | 969 | BRUNSWICK | District of Columbia | COMCAST IP PHONE, LLC | | More |
| 301 | 970 | WSNG238Z14 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 971 | WSHNGTNZN6 | Maryland | STARPOWER COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 972 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 973 | WSNG238Z14 | Maryland | BANDWIDTH.COM CLEC, LLC - MD | | More |
| 301 | 974 | LAUREL236 | Maryland | STARPOWER COMMUNICATIONS, LLC - MD | CLEC | More |
| 301 | 975 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 976 | WSHNGTNZN5 | Maryland | BALTIMORE-WASHINGTON TELEPHONE (BWT) | CLEC | More |
| 301 | 977 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 978 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 979 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 980 | WSHNGTNZN3 | Maryland | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD | WIRELESS PROV | More |
| 301 | 981 | WSHNGTNZN5 | Maryland | LEVEL 3 TELECOM OF MARYLAND, LLC - MD | CLEC | More |
| 301 | 982 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 983 | WSNGTNZN10 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 984 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 985 | WSHNGTNZN4 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 986 | WSHNGTNZN2 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 987 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 988 | HAGERSTOWN | Maryland | USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD | WIRELESS PROV | More |
| 301 | 989 | WSNGTNZN12 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 990 | GAITHERSBG | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 991 | HAGERSTOWN | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 992 | HAGERSTOWN | Maryland | METROPCS, INC. | | More |
| 301 | 993 | WSNG236Z13 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 994 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 995 | LXTNPKGRML | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 996 | WSHNGTNZN3 | Maryland | OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC | WIRELESS PROV | More |
| 301 | 997 | LEONARDTN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 998 | WSNGTNZN11 | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
| 301 | 999 | HAGERSTOWN | Maryland | VERIZON MARYLAND, INC. | RBOC | More |
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