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Area Code (410) Maryland, USA
| Area Code: | 410 |
| State: | Maryland (MD) |
| Country: | United States |
| Main Cities: | Baltimore, MD Towson, MD Annapolis, MD Catonsville, MD Salisbury, MD Elkridge, MD |
Area Code (410) serves 106 Cities:
Baltimore, Towson, Annapolis, Catonsville, Salisbury, Elkridge, Laurel, Columbia, Cockeysville, Glen Burnie, Bel Air, Easton, Pikesville, Linthicum Heights, Westminster, Severna Park, Ellicott City, Parkville, Arbutus, Woodlawn, Edgewood, Essex, Beltsville, Fork, Ocean City, Aberdeen, Severn, Odenton, Sykesville, Reisterstown, Elkton, Fallston, Berlin, Randallstown, Pasadena, Cambridge, Solomons, Chestertown, Brooklyn, Crofton, Dundalk, Prince Frederick, Jarrettsville, Churchville, Port Republic, North Beach, Centreville, Millersville, Hampstead, Parkton, Glenwood, Stevensville, Princess Anne, Rising Sun, Port Deposit, Warwick, Sherwood Forest, North East, Queenstown, White Marsh, Havre De Grace, Trappe, Sparrows Point, Galena, Rhodesdale, Tilghman, Millington, Hurlock, Still Pond, Cardiff, Federalsburg, Crisfield, Queen Anne, Union Bridge, Snow Hill, Jessup, Sparks Glencoe, Edgewater, New Windsor, Greensboro, Perryville, Oxford, Nanticoke, Preston, Abingdon, Chesapeake City, Ewell, Wye Mills, Church Hill, Delmar, Barclay, Saint Michaels, Pocomoke, Bishopville, Darlington, Taneytown, Marion, Arnold, Mardela Springs, Deal Island, Ridgely, Denton, Willards, Rock Hall, Crapo and West River located in the state of Maryland, United States.
Area Code (410) Maryland Counties:
Anne Arundel, Baltimore, Calvert, Caroline, Carroll, Cecil, Dorchester, Harford, Howard, Kent, Prince Georges, Queen Annes, Somerset, Talbot, Wicomico and Worcester.
Area Code 410 List of Prefixes
| Prefix | Location | Carrier | |
| (410) 200 | Easton | MarylandMD | MCI Worldcom Communications |
| (410) 202 | Salisbury | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 203 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 204 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 205 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 206 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 207 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 208 | Berlin | MarylandMD | Verizon Maryland |
| (410) 209 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 210 | Salisbury | MarylandMD | Aquis Communications |
| (410) 212 | Annapolis | MarylandMD | Sprint Spectrum L.P. |
| (410) 213 | Ocean City | MarylandMD | Verizon Maryland |
| (410) 214 | Rising Sun | MarylandMD | Core Communications |
| (410) 215 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 216 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 217 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 218 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 219 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 220 | Elkridge | MarylandMD | Sprint Spectrum L.P. |
| (410) 221 | Cambridge | MarylandMD | Verizon Maryland |
| (410) 222 | Severn | MarylandMD | Verizon Maryland |
| (410) 223 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 224 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 225 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 226 | Oxford | MarylandMD | Verizon Maryland |
| (410) 227 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 228 | Cambridge | MarylandMD | Verizon Maryland |
| (410) 229 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 230 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 231 | Solomons | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 232 | Baltimore | MarylandMD | USA Mobility Wireless Inc |
| (410) 233 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 234 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 235 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 236 | Towson | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 237 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 238 | Essex | MarylandMD | Verizon Maryland |
| (410) 239 | Hampstead | MarylandMD | Verizon Maryland |
| (410) 240 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 241 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 242 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 243 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 244 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 245 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 246 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 247 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 248 | Parkville | MarylandMD | Verizon Maryland |
| (410) 249 | Towson | MarylandMD | Verizon Maryland |
| (410) 250 | Ocean City | MarylandMD | Verizon Maryland |
| (410) 251 | Salisbury | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 252 | Towson | MarylandMD | Verizon Maryland |
| (410) 253 | Easton | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 254 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 255 | Pasadena | MarylandMD | Verizon Maryland |
| (410) 256 | Parkville | MarylandMD | Verizon Maryland |
| (410) 257 | North Beach | MarylandMD | Verizon Maryland |
| (410) 258 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 259 | Westminster | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 260 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 261 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 262 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 263 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 264 | Laurel | MarylandMD | Verizon Maryland |
| (410) 265 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 266 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 267 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 268 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 269 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 270 | Salisbury | MarylandMD | Redi-call Communications Co |
| (410) 271 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 272 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 273 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 274 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 275 | Warwick | MarylandMD | Verizon Maryland |
| (410) 276 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 277 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 278 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 279 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 280 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 281 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 282 | Dundalk | MarylandMD | Verizon Maryland |
| (410) 283 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 284 | Dundalk | MarylandMD | Verizon Maryland |
| (410) 285 | Dundalk | MarylandMD | Verizon Maryland |
| (410) 286 | North Beach | MarylandMD | Verizon Maryland |
| (410) 287 | North East | MarylandMD | Verizon Maryland |
| (410) 288 | Dundalk | MarylandMD | Verizon Maryland |
| (410) 289 | Ocean City | MarylandMD | Verizon Maryland |
| (410) 290 | Columbia | MarylandMD | Verizon Maryland |
| (410) 291 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 292 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 293 | Annapolis | MarylandMD | Paetec Communications |
| (410) 294 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 295 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 296 | Towson | MarylandMD | Verizon Maryland |
| (410) 297 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 298 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 299 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 300 | Elkridge | MarylandMD | Sprint Spectrum L.P. |
| (410) 301 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 302 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 303 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 304 | Queenstown | MarylandMD | IDT Telecom, Inc. |
| (410) 305 | Odenton | MarylandMD | Verizon Maryland |
| (410) 306 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 307 | Towson | MarylandMD | Verizon Maryland |
| (410) 308 | Towson | MarylandMD | Verizon Maryland |
| (410) 309 | Columbia | MarylandMD | Verizon Maryland |
| (410) 310 | Easton | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 312 | Columbia | MarylandMD | Verizon Maryland |
| (410) 313 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 314 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 315 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 316 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 317 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 318 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 319 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 320 | Annapolis | MarylandMD | Sprint Spectrum L.P. |
| (410) 321 | Towson | MarylandMD | Verizon Maryland |
| (410) 322 | Bel Air | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 323 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 324 | Towson | MarylandMD | Verizon Maryland |
| (410) 325 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 326 | Solomons | MarylandMD | Verizon Maryland |
| (410) 327 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 328 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 329 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 330 | Cambridge | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 331 | Elkridge | MarylandMD | USA Mobility Wireless Inc |
| (410) 332 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 333 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 334 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 335 | White Marsh | MarylandMD | Verizon Maryland |
| (410) 336 | Baltimore | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 337 | Towson | MarylandMD | Verizon Maryland |
| (410) 338 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 339 | Towson | MarylandMD | Verizon Maryland |
| (410) 340 | Baltimore | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 341 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 342 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 343 | Parkton | MarylandMD | Verizon Maryland |
| (410) 344 | White Marsh | MarylandMD | Verizon Maryland |
| (410) 345 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 346 | Westminster | MarylandMD | Verizon Maryland |
| (410) 347 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 348 | Still Pond | MarylandMD | Verizon Maryland |
| (410) 349 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 350 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 351 | Baltimore | MarylandMD | USA Mobility Wireless Inc |
| (410) 352 | Bishopville | MarylandMD | Verizon Maryland |
| (410) 353 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 354 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 355 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 356 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 357 | Parkton | MarylandMD | Verizon Maryland |
| (410) 358 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 359 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 360 | Pasadena | MarylandMD | Verizon Maryland |
| (410) 361 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 362 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 363 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 364 | Queen Anne | MarylandMD | Verizon Maryland |
| (410) 365 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 366 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 367 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 368 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 369 | Baltimore | MarylandMD | TW Telecom of Maryland LLC |
| (410) 370 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 371 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 372 | Towson | MarylandMD | Verizon Maryland |
| (410) 373 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 374 | Hampstead | MarylandMD | Verizon Maryland |
| (410) 375 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 376 | Mardela Springs | MarylandMD | Verizon Maryland |
| (410) 377 | Towson | MarylandMD | Verizon Maryland |
| (410) 378 | Port Deposit | MarylandMD | Verizon Maryland |
| (410) 379 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 380 | Salisbury | MarylandMD | Redi-call Communications Co |
| (410) 381 | Columbia | MarylandMD | Verizon Maryland |
| (410) 382 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 383 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 384 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 385 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 386 | Westminster | MarylandMD | Verizon Maryland |
| (410) 387 | Arbutus | MarylandMD | Broadview Networks |
| (410) 388 | Sparrows Point | MarylandMD | Verizon Maryland |
| (410) 389 | Baltimore | MarylandMD | USA Mobility Wireless Inc |
| (410) 390 | Ocean City | MarylandMD | Teleport Communications America |
| (410) 391 | Essex | MarylandMD | Verizon Maryland |
| (410) 392 | Elkton | MarylandMD | Verizon Maryland |
| (410) 393 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 394 | Solomons | MarylandMD | Verizon Maryland |
| (410) 395 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 396 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 397 | Crapo | MarylandMD | Verizon Maryland |
| (410) 398 | Elkton | MarylandMD | Verizon Maryland |
| (410) 399 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 400 | Baltimore | MarylandMD | Cavalier Telephone Mid-Atlantic |
| (410) 401 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 402 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 403 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 404 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 405 | Fork | MarylandMD | Verizon Maryland |
| (410) 406 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 407 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 408 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 409 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 412 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 413 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 414 | Prince Frederick | MarylandMD | Verizon Maryland |
| (410) 415 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 416 | Laurel | MarylandMD | Verizon Maryland |
| (410) 417 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 418 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 419 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 420 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 421 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 422 | Salisbury | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 423 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 424 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 425 | Ewell | MarylandMD | Verizon Maryland |
| (410) 426 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 427 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 428 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 429 | Reisterstown | MarylandMD | Verizon Maryland |
| (410) 430 | Salisbury | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 431 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 432 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 433 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 434 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 435 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 436 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 437 | Pasadena | MarylandMD | Verizon Maryland |
| (410) 438 | Barclay | MarylandMD | Verizon Maryland |
| (410) 439 | Pasadena | MarylandMD | Verizon Maryland |
| (410) 440 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 441 | Elkton | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 442 | Glenwood | MarylandMD | Verizon Maryland |
| (410) 443 | Easton | MarylandMD | Level 3 Communications |
| (410) 444 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 445 | Baltimore | MarylandMD | USA Mobility Wireless Inc |
| (410) 446 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 447 | Columbia | MarylandMD | USA Mobility Wireless Inc |
| (410) 448 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 449 | Solomons | MarylandMD | Bandwidth.com - CLEC |
| (410) 450 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 451 | Crofton | MarylandMD | Verizon Maryland |
| (410) 452 | Cardiff | MarylandMD | Verizon Maryland |
| (410) 453 | Towson | MarylandMD | Verizon Maryland |
| (410) 454 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 455 | Catonsville | MarylandMD | Verizon Maryland |
| (410) 456 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 457 | Darlington | MarylandMD | Verizon Maryland |
| (410) 458 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 459 | Fallston | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 460 | Elkridge | MarylandMD | USA Mobility Wireless Inc |
| (410) 461 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 462 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 463 | Trappe | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 464 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 465 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 466 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 467 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 468 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 469 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 470 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 471 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 472 | Sparks Glencoe | MarylandMD | Verizon Maryland |
| (410) 473 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 474 | Prince Frederick | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 475 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 476 | Trappe | MarylandMD | Verizon Maryland |
| (410) 477 | Sparrows Point | MarylandMD | Verizon Maryland |
| (410) 478 | Elkridge | MarylandMD | USA Mobility Wireless Inc |
| (410) 479 | Denton | MarylandMD | Verizon Maryland |
| (410) 480 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 482 | Greensboro | MarylandMD | Verizon Maryland |
| (410) 483 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 484 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 485 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 486 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 487 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 488 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 489 | Glenwood | MarylandMD | Verizon Maryland |
| (410) 490 | Centreville | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 491 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 492 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 493 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 494 | Towson | MarylandMD | Verizon Maryland |
| (410) 495 | Port Republic | MarylandMD | Verizon Maryland |
| (410) 496 | Randallstown | MarylandMD | Verizon Maryland |
| (410) 497 | Baltimore | MarylandMD | Comcast Phone of Northern Maryland |
| (410) 498 | Baltimore | MarylandMD | Cavalier Telephone Mid-Atlantic |
| (410) 499 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 500 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 501 | Arbutus | MarylandMD | Lightwave Communications |
| (410) 502 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 503 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 504 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 505 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 506 | Elkton | MarylandMD | Verizon Maryland |
| (410) 507 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 508 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 509 | Baltimore | MarylandMD | Baltimore-washington Telephone (BWT) |
| (410) 510 | Fork | MarylandMD | Teleport Communications America |
| (410) 512 | Towson | MarylandMD | Verizon Maryland |
| (410) 513 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 514 | Severn | MarylandMD | Verizon Maryland |
| (410) 515 | Abingdon | MarylandMD | Verizon Maryland |
| (410) 516 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 517 | Reisterstown | MarylandMD | Verizon Maryland |
| (410) 518 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 519 | Severn | MarylandMD | Verizon Maryland |
| (410) 520 | Ocean City | MarylandMD | Verizon Maryland |
| (410) 521 | Randallstown | MarylandMD | Verizon Maryland |
| (410) 522 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 523 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 524 | Ocean City | MarylandMD | Verizon Maryland |
| (410) 525 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 526 | Reisterstown | MarylandMD | Verizon Maryland |
| (410) 527 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 528 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 529 | Parkville | MarylandMD | Verizon Maryland |
| (410) 530 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 531 | Columbia | MarylandMD | Verizon Maryland |
| (410) 532 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 533 | Annapolis | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 534 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 535 | Port Republic | MarylandMD | Verizon Maryland |
| (410) 536 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 537 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 538 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 539 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 540 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 541 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 542 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 543 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 544 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 545 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 546 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 547 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 548 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 549 | Sykesville | MarylandMD | Verizon Maryland |
| (410) 550 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 551 | Severn | MarylandMD | Verizon Maryland |
| (410) 552 | Sykesville | MarylandMD | Verizon Maryland |
| (410) 553 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 554 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 556 | Church Hill | MarylandMD | Verizon Maryland |
| (410) 557 | Jarrettsville | MarylandMD | Verizon Maryland |
| (410) 558 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 559 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 560 | Towson | MarylandMD | Verizon Maryland |
| (410) 561 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 562 | Annapolis | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 563 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 564 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 565 | Arbutus | MarylandMD | TW Telecom of Maryland LLC |
| (410) 566 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 567 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 568 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 569 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 570 | Annapolis | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 571 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 572 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 573 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 574 | Essex | MarylandMD | Verizon Maryland |
| (410) 575 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 576 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 577 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 578 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 579 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 580 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 581 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 582 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 583 | Towson | MarylandMD | Verizon Maryland |
| (410) 584 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 585 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 586 | Port Republic | MarylandMD | Verizon Maryland |
| (410) 587 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 588 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 589 | Brooklyn | MarylandMD | TW Telecom of Maryland LLC |
| (410) 590 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 591 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 592 | Fork | MarylandMD | Verizon Maryland |
| (410) 593 | Fork | MarylandMD | Verizon Maryland |
| (410) 594 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 595 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 596 | Westminster | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 597 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 598 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 599 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 600 | Berlin | MarylandMD | Sprint Communications Company, L.P. |
| (410) 601 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 602 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 603 | Salisbury | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 604 | Stevensville | MarylandMD | Verizon Maryland |
| (410) 605 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 606 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 607 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 608 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 609 | Brooklyn | MarylandMD | Verizon Maryland |
| (410) 610 | Prince Frederick | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 612 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 613 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 614 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 615 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 616 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 617 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 618 | Salisbury | MarylandMD | IDT Telecom, Inc. |
| (410) 619 | Laurel | MarylandMD | Verizon Maryland |
| (410) 620 | Elkton | MarylandMD | Verizon Maryland |
| (410) 621 | Princess Anne | MarylandMD | Verizon Maryland |
| (410) 622 | Salisbury | MarylandMD | MCI Worldcom Communications |
| (410) 623 | Marion | MarylandMD | Verizon Maryland |
| (410) 624 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 625 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 626 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 627 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 628 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 629 | Berlin | MarylandMD | Verizon Maryland |
| (410) 630 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 631 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 632 | Snow Hill | MarylandMD | Verizon Maryland |
| (410) 633 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 634 | Ridgely | MarylandMD | Verizon Maryland |
| (410) 635 | New Windsor | MarylandMD | Verizon Maryland |
| (410) 636 | Brooklyn | MarylandMD | Verizon Maryland |
| (410) 637 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 638 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 639 | Rock Hall | MarylandMD | Verizon Maryland |
| (410) 640 | Baltimore | MarylandMD | USA Mobility Wireless Inc |
| (410) 641 | Berlin | MarylandMD | Verizon Maryland |
| (410) 642 | Perryville | MarylandMD | Verizon Maryland |
| (410) 643 | Stevensville | MarylandMD | Verizon Maryland |
| (410) 644 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 645 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 646 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 647 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 648 | Galena | MarylandMD | Verizon Maryland |
| (410) 649 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 650 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 651 | Princess Anne | MarylandMD | Verizon Maryland |
| (410) 652 | Bel Air | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 653 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 654 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 655 | Randallstown | MarylandMD | Verizon Maryland |
| (410) 656 | North East | MarylandMD | Armstrong Telecommunications |
| (410) 657 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 658 | Rising Sun | MarylandMD | Armstrong Telephone Co. of Maryland |
| (410) 659 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 660 | Elkridge | MarylandMD | Sprint Spectrum L.P. |
| (410) 661 | Parkville | MarylandMD | Verizon Maryland |
| (410) 662 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 663 | Parkville | MarylandMD | Verizon Maryland |
| (410) 664 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 665 | Parkville | MarylandMD | Verizon Maryland |
| (410) 666 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 667 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 668 | Parkville | MarylandMD | Verizon Maryland |
| (410) 669 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 670 | Edgewood | MarylandMD | MCI Worldcom Communications |
| (410) 671 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 672 | Odenton | MarylandMD | Verizon Maryland |
| (410) 673 | Preston | MarylandMD | Verizon Maryland |
| (410) 674 | Odenton | MarylandMD | Verizon Maryland |
| (410) 675 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 676 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 677 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 678 | Elkridge | MarylandMD | USA Mobility Wireless Inc |
| (410) 679 | Edgewood | MarylandMD | Verizon Maryland |
| (410) 680 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 681 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 682 | Essex | MarylandMD | Verizon Maryland |
| (410) 683 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 684 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 685 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 686 | Essex | MarylandMD | Verizon Maryland |
| (410) 687 | Essex | MarylandMD | Verizon Maryland |
| (410) 688 | Fallston | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 689 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 690 | Wye Mills | MarylandMD | AT&T Local |
| (410) 691 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 692 | Jarrettsville | MarylandMD | Verizon Maryland |
| (410) 693 | Annapolis | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 694 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 695 | Odenton | MarylandMD | Verizon Maryland |
| (410) 696 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 697 | Millersville | MarylandMD | MCI Worldcom Communications |
| (410) 698 | Fork | MarylandMD | MCI Worldcom Communications |
| (410) 699 | Chestertown | MarylandMD | Sprint Spectrum L.P. |
| (410) 701 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 702 | Reisterstown | MarylandMD | MCI Worldcom Communications |
| (410) 703 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 704 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 705 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 706 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 707 | Columbia | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 708 | Chestertown | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 709 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 710 | Baltimore | MarylandMD | Omnipoint Communications Cap Operations |
| (410) 712 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 713 | Salisbury | MarylandMD | Level 3 Communications |
| (410) 714 | Easton | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 715 | Columbia | MarylandMD | Verizon Maryland |
| (410) 716 | Towson | MarylandMD | Verizon Maryland |
| (410) 717 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 718 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 719 | Catonsville | MarylandMD | Verizon Maryland |
| (410) 720 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 721 | Crofton | MarylandMD | Verizon Maryland |
| (410) 722 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 723 | Ocean City | MarylandMD | Verizon Maryland |
| (410) 724 | Laurel | MarylandMD | Verizon Maryland |
| (410) 725 | Easton | MarylandMD | Sprint Spectrum L.P. |
| (410) 726 | Salisbury | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 727 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 728 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 729 | Severn | MarylandMD | Verizon Maryland |
| (410) 730 | Columbia | MarylandMD | Verizon Maryland |
| (410) 731 | Annapolis | MarylandMD | USA Mobility Wireless Inc |
| (410) 732 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 733 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 734 | Churchville | MarylandMD | Verizon Maryland |
| (410) 735 | Baltimore | MarylandMD | Cavalier Telephone Mid-Atlantic |
| (410) 736 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 737 | Arbutus | MarylandMD | Verizon Maryland |
| (410) 738 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 739 | Centreville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 740 | Columbia | MarylandMD | Verizon Maryland |
| (410) 741 | North Beach | MarylandMD | Verizon Maryland |
| (410) 742 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 743 | Baltimore | MarylandMD | USA Mobility Wireless Inc |
| (410) 744 | Catonsville | MarylandMD | Verizon Maryland |
| (410) 745 | Saint Michaels | MarylandMD | Verizon Maryland |
| (410) 746 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 747 | Catonsville | MarylandMD | Verizon Maryland |
| (410) 748 | Ellicott City | MarylandMD | USA Mobility Wireless Inc |
| (410) 749 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 750 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 751 | Westminster | MarylandMD | Verizon Maryland |
| (410) 752 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 753 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 754 | Federalsburg | MarylandMD | Verizon Maryland |
| (410) 755 | Warwick | MarylandMD | Verizon Maryland |
| (410) 756 | Taneytown | MarylandMD | Verizon Maryland |
| (410) 757 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 758 | Centreville | MarylandMD | Verizon Maryland |
| (410) 759 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 760 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 761 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 762 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 763 | Easton | MarylandMD | Verizon Maryland |
| (410) 764 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 765 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 766 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 767 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 768 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 769 | Towson | MarylandMD | Verizon Maryland |
| (410) 770 | Easton | MarylandMD | Verizon Maryland |
| (410) 771 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 772 | Columbia | MarylandMD | Verizon Maryland |
| (410) 773 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 774 | Crofton | MarylandMD | MCI Worldcom Communications |
| (410) 775 | Union Bridge | MarylandMD | Verizon Maryland |
| (410) 776 | Bel Air | MarylandMD | Teleport Communications America |
| (410) 777 | Severna Park | MarylandMD | MCI Worldcom Communications |
| (410) 778 | Chestertown | MarylandMD | Verizon Maryland |
| (410) 779 | Baltimore | MarylandMD | Level 3 Communications |
| (410) 780 | Essex | MarylandMD | Verizon Maryland |
| (410) 781 | Sykesville | MarylandMD | Verizon Maryland |
| (410) 782 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 783 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 784 | Deal Island | MarylandMD | Verizon Maryland |
| (410) 785 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 786 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 787 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 788 | Catonsville | MarylandMD | Verizon Maryland |
| (410) 789 | Brooklyn | MarylandMD | Verizon Maryland |
| (410) 790 | Towson | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 791 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 792 | Laurel | MarylandMD | Verizon Maryland |
| (410) 793 | Crofton | MarylandMD | Verizon Maryland |
| (410) 794 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 795 | Sykesville | MarylandMD | Verizon Maryland |
| (410) 796 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 797 | Laurel | MarylandMD | Verizon Maryland |
| (410) 798 | Edgewater | MarylandMD | Verizon Maryland |
| (410) 799 | Elkridge | MarylandMD | Verizon Maryland |
| (410) 800 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 801 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 802 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 803 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 804 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 805 | Towson | MarylandMD | Sprint Spectrum L.P. |
| (410) 806 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 807 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 808 | Fallston | MarylandMD | Sprint Spectrum L.P. |
| (410) 809 | Bel Air | MarylandMD | Cavalier Telephone (Mid-Atlantic) |
| (410) 810 | Chestertown | MarylandMD | Verizon Maryland |
| (410) 812 | Towson | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 813 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 814 | Baltimore | MarylandMD | Cavalier Telephone Mid-Atlantic |
| (410) 815 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 816 | Towson | MarylandMD | Verizon Maryland |
| (410) 817 | Fork | MarylandMD | Verizon Maryland |
| (410) 818 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 819 | Easton | MarylandMD | Verizon Maryland |
| (410) 820 | Easton | MarylandMD | Verizon Maryland |
| (410) 821 | Towson | MarylandMD | Verizon Maryland |
| (410) 822 | Easton | MarylandMD | Verizon Maryland |
| (410) 823 | Towson | MarylandMD | Verizon Maryland |
| (410) 824 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 825 | Towson | MarylandMD | Verizon Maryland |
| (410) 826 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 827 | Queenstown | MarylandMD | Verizon Maryland |
| (410) 828 | Towson | MarylandMD | Verizon Maryland |
| (410) 829 | Easton | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 830 | Towson | MarylandMD | Verizon Maryland |
| (410) 831 | Salisbury | MarylandMD | Halo Wireless Services |
| (410) 832 | Towson | MarylandMD | Verizon Maryland |
| (410) 833 | Reisterstown | MarylandMD | Verizon Maryland |
| (410) 834 | Laurel | MarylandMD | Verizon Maryland |
| (410) 835 | Willards | MarylandMD | Verizon Maryland |
| (410) 836 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 837 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 838 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 839 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 840 | Westminster | MarylandMD | Verizon Maryland |
| (410) 841 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 842 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 843 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 844 | Baltimore | MarylandMD | Peerless Network of Maryland |
| (410) 845 | Salisbury | MarylandMD | Sprint Spectrum L.P. |
| (410) 846 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 847 | Towson | MarylandMD | Verizon Maryland |
| (410) 848 | Westminster | MarylandMD | Verizon Maryland |
| (410) 849 | Sherwood Forest | MarylandMD | Verizon Maryland |
| (410) 850 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 851 | Towson | MarylandMD | Verizon Maryland |
| (410) 852 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 853 | Towson | MarylandMD | Verizon Maryland |
| (410) 854 | Odenton | MarylandMD | Verizon Maryland |
| (410) 855 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 856 | Cockeysville | MarylandMD | Verizon Maryland |
| (410) 857 | Westminster | MarylandMD | Verizon Maryland |
| (410) 858 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 859 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 860 | Salisbury | MarylandMD | Verizon Maryland |
| (410) 861 | Reisterstown | MarylandMD | Verizon Maryland |
| (410) 862 | Laurel | MarylandMD | Verizon Maryland |
| (410) 863 | Glen Burnie | MarylandMD | Verizon Maryland |
| (410) 864 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 865 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 866 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 867 | West River | MarylandMD | Verizon Maryland |
| (410) 868 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 869 | Catonsville | MarylandMD | Verizon Maryland |
| (410) 870 | Parkville | MarylandMD | Comcast Phone of Northern Maryland |
| (410) 871 | Westminster | MarylandMD | Verizon Maryland |
| (410) 872 | Columbia | MarylandMD | Verizon Maryland |
| (410) 873 | Nanticoke | MarylandMD | Verizon Maryland |
| (410) 874 | Odenton | MarylandMD | MCI Worldcom Communications |
| (410) 875 | Westminster | MarylandMD | Verizon Maryland |
| (410) 876 | Westminster | MarylandMD | Verizon Maryland |
| (410) 877 | Fallston | MarylandMD | Verizon Maryland |
| (410) 878 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 879 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 880 | Laurel | MarylandMD | Verizon Maryland |
| (410) 881 | Sherwood Forest | MarylandMD | MCI Worldcom Communications |
| (410) 882 | Parkville | MarylandMD | Verizon Maryland |
| (410) 883 | Rhodesdale | MarylandMD | Verizon Maryland |
| (410) 884 | Columbia | MarylandMD | Verizon Maryland |
| (410) 885 | Chesapeake City | MarylandMD | Verizon Maryland |
| (410) 886 | Tilghman | MarylandMD | Verizon Maryland |
| (410) 887 | Towson | MarylandMD | Verizon Maryland |
| (410) 888 | Laurel | MarylandMD | Verizon Maryland |
| (410) 889 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 890 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 891 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 892 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 893 | Bel Air | MarylandMD | Verizon Maryland |
| (410) 894 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 895 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 896 | Delmar | MarylandMD | Verizon Maryland |
| (410) 897 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 898 | Beltsville | MarylandMD | Verizon Maryland |
| (410) 899 | Towson | MarylandMD | USA Mobility Wireless Inc |
| (410) 900 | Baltimore | MarylandMD | CTC Communications Corp. |
| (410) 901 | Cambridge | MarylandMD | Verizon Maryland |
| (410) 902 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 903 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 904 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 905 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 906 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 907 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 908 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 909 | Elkridge | MarylandMD | USA Mobility Wireless Inc |
| (410) 910 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 912 | Salisbury | MarylandMD | Cavalier Telephone (Mid-Atlantic) |
| (410) 913 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 914 | Churchville | MarylandMD | Cavalier Telephone (Mid-Atlantic) |
| (410) 915 | Baltimore | MarylandMD | Baltimore-washington Telephone (BWT) |
| (410) 916 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 917 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 918 | Essex | MarylandMD | Verizon Maryland |
| (410) 919 | Annapolis | MarylandMD | MCI Worldcom Communications |
| (410) 920 | Elkton | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 921 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 922 | Randallstown | MarylandMD | Verizon Maryland |
| (410) 923 | Millersville | MarylandMD | Verizon Maryland |
| (410) 924 | Easton | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 925 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 926 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 927 | Laurel | MarylandMD | TW Telecom of Maryland LLC |
| (410) 928 | Millington | MarylandMD | Verizon Maryland |
| (410) 929 | Baltimore | MarylandMD | Bandwidth.com - CLEC |
| (410) 930 | Baltimore | MarylandMD | Redi-call Communications Co |
| (410) 931 | Parkville | MarylandMD | Verizon Maryland |
| (410) 932 | Elkridge | MarylandMD | USA Mobility Wireless Inc |
| (410) 933 | Parkville | MarylandMD | Verizon Maryland |
| (410) 934 | Annapolis | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 935 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 937 | Fallston | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 938 | Towson | MarylandMD | Verizon Maryland |
| (410) 939 | Havre De Grace | MarylandMD | Verizon Maryland |
| (410) 940 | Annapolis | MarylandMD | Atx Telecommunications Services, LTD |
| (410) 941 | Jarrettsville | MarylandMD | Verizon Maryland |
| (410) 942 | Havre De Grace | MarylandMD | Verizon Maryland |
| (410) 943 | Hurlock | MarylandMD | Verizon Maryland |
| (410) 944 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 945 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 946 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 947 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 948 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 949 | Baltimore | MarylandMD | MCI Worldcom Communications |
| (410) 951 | Baltimore | MarylandMD | Teleport Communications America |
| (410) 952 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 953 | Columbia | MarylandMD | Verizon Maryland |
| (410) 955 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 956 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 957 | Pocomoke | MarylandMD | Verizon Maryland |
| (410) 960 | Baltimore | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 961 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 962 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 963 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 964 | Columbia | MarylandMD | Verizon Maryland |
| (410) 965 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 966 | Woodlawn | MarylandMD | Verizon Maryland |
| (410) 967 | Towson | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 968 | Crisfield | MarylandMD | Verizon Maryland |
| (410) 969 | Severn | MarylandMD | Verizon Maryland |
| (410) 970 | Sykesville | MarylandMD | MCI Worldcom Communications |
| (410) 971 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 972 | Annapolis | MarylandMD | Teleport Communications America |
| (410) 973 | Berlin | MarylandMD | MCC Telephony of The Mid-Atlantic |
| (410) 974 | Arnold | MarylandMD | Verizon Maryland |
| (410) 975 | Severna Park | MarylandMD | Verizon Maryland |
| (410) 977 | Baltimore | MarylandMD | Sprint Spectrum L.P. |
| (410) 978 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 979 | Catonsville | MarylandMD | New Cingular Wireless PCS, LLC |
| (410) 980 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 981 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 982 | Baltimore | MarylandMD | Quantum Telecommunications |
| (410) 983 | Fork | MarylandMD | Verizon Maryland |
| (410) 984 | Sykesville | MarylandMD | Sprint Spectrum L.P. |
| (410) 985 | Jessup | MarylandMD | Baltimore-washington Telephone (BWT) |
| (410) 986 | Baltimore | MarylandMD | Verizon Maryland |
| (410) 987 | Severn | MarylandMD | Verizon Maryland |
| (410) 988 | Columbia | MarylandMD | Verizon Maryland |
| (410) 989 | Churchville | MarylandMD | Verizon Maryland |
| (410) 990 | Annapolis | MarylandMD | Verizon Maryland |
| (410) 991 | Annapolis | MarylandMD | Cellco Partnership DBA Verizon |
| (410) 992 | Columbia | MarylandMD | Verizon Maryland |
| (410) 993 | Linthicum Heights | MarylandMD | Verizon Maryland |
| (410) 994 | Aberdeen | MarylandMD | Verizon Maryland |
| (410) 995 | Ellicott City | MarylandMD | Verizon Maryland |
| (410) 996 | Port Deposit | MarylandMD | Verizon Maryland |
| (410) 997 | Columbia | MarylandMD | Verizon Maryland |
| (410) 998 | Pikesville | MarylandMD | Verizon Maryland |
| (410) 999 | Baltimore | MarylandMD | Baltimore-washington Telephone (BWT) |