Information for Area Code: 410-xxx-xxxx - MD - MARYLAND

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Information about Area Code 410

Maryland comprises the red and blue area of the map; the red area is covered by area codes 410 and 443
Maryland comprises the red and blue area of the map; the red area is covered by area codes 410 and 443

North American area codes 410 and 443 are state of Maryland telephone area codes which serve the communities of Baltimore, North East, Rising Sun, the state capital of Annapolis, and the Eastern Shore. Area code 410 was split from area code 301 on October 6, 1991. The overlay area code, 443, was introduced on June 1, 1997.

The counties and independent city served by these area codes include:


State of Maryland Area Codes: 240, 301, 410, 443
North: 717, 484/610/835
West: 301/240 area codes 410/443 East: 302
South: 757
State of Delaware Area Code: 302
Commonwealth of Pennsylvania Area Codes: 215, 267, 412, 484, 570, 610, 717, 724, 814, 835, 878
Commonwealth of Virginia Area Codes: 276, 434, 540, 571/703, 757, 804


See also


Exchanges for Area Code 410-xxx-xxxx:

Exchange 410-200
Easton - MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-201
ODDBALL CODES -

Exchange 410-202
- NATIONSLINE, INC.-MD

Exchange 410-203
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-204
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-205
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-206
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-207
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-208
OCEAN PINES - VERIZON MARYLAND, INC.

Exchange 410-209
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-210
SALISBURY - AQUIS COMMUNICATIONS, INC.

Exchange 410-211
-

Exchange 410-212
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-213
Ocean City - VERIZON MARYLAND, INC.

Exchange 410-214
Baltimore - GEOTEK COMMUNICATIONS, INC.

Exchange 410-215
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-216
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-217
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-218
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-219
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-220
-

Exchange 410-221
Cambridge - VERIZON MARYLAND, INC.

Exchange 410-222
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-223
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-224
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-225
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-226
OXFORD - VERIZON MARYLAND, INC.

Exchange 410-227
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-228
Cambridge - VERIZON MARYLAND, INC.

Exchange 410-229
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-230
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-231
HUNTINGTOWN - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-232
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-233
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-234
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-235
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-236
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-237
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-238
Essex - VERIZON MARYLAND, INC.

Exchange 410-239
HAMPSTEAD - VERIZON MARYLAND, INC.

Exchange 410-240
-

Exchange 410-241
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-242
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-243
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-244
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-245
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-246
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-247
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-248
PERRY HALL - VERIZON MARYLAND, INC.

Exchange 410-249
Towson - VERIZON MARYLAND, INC.

Exchange 410-250
OCEAN CITY - VERIZON MARYLAND, INC.

Exchange 410-251
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-252
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-253
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-254
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-255
ARMIGER - VERIZON MARYLAND, INC.

Exchange 410-256
PERRY HALL - VERIZON MARYLAND, INC.

Exchange 410-257
NORTH BEACH - VERIZON MARYLAND, INC.

Exchange 410-258
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-259
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-260
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-261
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-262
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-263
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-264
Laurel - VERIZON MARYLAND, INC.

Exchange 410-265
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-266
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-267
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-268
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-269
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-270
Salisbury - REDI-CALL COMMUNICATIONS CO

Exchange 410-271
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-272
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-273
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-274
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-275
CECILTON - VERIZON MARYLAND, INC.

Exchange 410-276
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-277
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-278
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-279
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-280
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-281
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-282
Dundalk - VERIZON MARYLAND, INC.

Exchange 410-283
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-284
Dundalk - VERIZON MARYLAND, INC.

Exchange 410-285
Dundalk - VERIZON MARYLAND, INC.

Exchange 410-286
NORTH BEACH - VERIZON MARYLAND, INC.

Exchange 410-287
North East - VERIZON MARYLAND, INC.

Exchange 410-288
Dundalk - VERIZON MARYLAND, INC.

Exchange 410-289
Ocean City - VERIZON MARYLAND, INC.

Exchange 410-290
Columbia - VERIZON MARYLAND, INC.

Exchange 410-291
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-292
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-293
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 410-294
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-295
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-296
Towson - VERIZON MARYLAND, INC.

Exchange 410-297
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-298
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-299
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-300
- SPRINT SPECTRUM L.P.

Exchange 410-301
-

Exchange 410-302
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-303
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-304
-

Exchange 410-305
ODENTON - VERIZON MARYLAND, INC.

Exchange 410-306
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-307
Towson - VERIZON MARYLAND, INC.

Exchange 410-308
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-309
Columbia - VERIZON MARYLAND, INC.

Exchange 410-310
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-311
-

Exchange 410-312
Columbia - VERIZON MARYLAND, INC.

Exchange 410-313
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-314
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-315
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-316
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-317
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-318
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-319
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-320
Annapolis - NEXTEL COMMUNICATIONS

Exchange 410-321
Towson - VERIZON MARYLAND, INC.

Exchange 410-322
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-323
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-324
Towson - VERIZON MARYLAND, INC.

Exchange 410-325
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-326
SOLOMONS - VERIZON MARYLAND, INC.

Exchange 410-327
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-328
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-329
MANOR - VERIZON MARYLAND, INC.

Exchange 410-330
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-331
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-332
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-333
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-334
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-335
CHASE - VERIZON MARYLAND, INC.

Exchange 410-336
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 410-337
Towson - VERIZON MARYLAND, INC.

Exchange 410-338
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-339
Towson - VERIZON MARYLAND, INC.

Exchange 410-340
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 410-341
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-342
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-343
PARKTON - VERIZON MARYLAND, INC.

Exchange 410-344
CHASE - VERIZON MARYLAND, INC.

Exchange 410-345
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-346
Westminster - VERIZON MARYLAND, INC.

Exchange 410-347
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-348
STILL POND - VERIZON MARYLAND, INC.

Exchange 410-349
SAINT MARGARETS - VERIZON MARYLAND, INC.

Exchange 410-350
BROOKLYN - VERIZON MARYLAND, INC.

Exchange 410-351
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-352
BISHOP - VERIZON MARYLAND, INC.

Exchange 410-353
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-354
BROOKLYN - VERIZON MARYLAND, INC.

Exchange 410-355
BROOKLYN - VERIZON MARYLAND, INC.

Exchange 410-356
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-357
PARKTON - VERIZON MARYLAND, INC.

Exchange 410-358
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-359
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-360
ARMIGER - VERIZON MARYLAND, INC.

Exchange 410-361
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-362
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-363
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-364
HILLSBORO - VERIZON MARYLAND, INC.

Exchange 410-365
Baltimore - NEXTEL COMMUNICATIONS

Exchange 410-366
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-367
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 410-368
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-369
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-370
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-371
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-372
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-373
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-374
HAMPSTEAD - VERIZON MARYLAND, INC.

Exchange 410-375
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-376
VIENNA - VERIZON MARYLAND, INC.

Exchange 410-377
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-378
BAINBRIDGE - VERIZON MARYLAND, INC.

Exchange 410-379
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-380
Salisbury - REDI-CALL COMMUNICATIONS CO

Exchange 410-381
Columbia - VERIZON MARYLAND, INC.

Exchange 410-382
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-383
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-384
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-385
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-386
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-387
- METROCALL

Exchange 410-388
Sparrows Point - VERIZON MARYLAND, INC.

Exchange 410-389
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-390
Pikesville - WEBLINK WIRELESS, INC.

Exchange 410-391
Essex - VERIZON MARYLAND, INC.

Exchange 410-392
Elkton - VERIZON MARYLAND, INC.

Exchange 410-393
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-394
SOLOMONS - VERIZON MARYLAND, INC.

Exchange 410-395
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-396
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-397
HONGA - VERIZON MARYLAND, INC.

Exchange 410-398
Elkton - VERIZON MARYLAND, INC.

Exchange 410-399
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-400
Hanover -

Exchange 410-401
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-402
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-403
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-404
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-405
FORK - VERIZON MARYLAND, INC.

Exchange 410-406
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-407
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-408
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-409
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-410
-

Exchange 410-411
-

Exchange 410-412
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-413
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-414
Prince Frederick - VERIZON MARYLAND, INC.

Exchange 410-415
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-416
Laurel - VERIZON MARYLAND, INC.

Exchange 410-418
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-419
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-420
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-421
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-422
SALISBURY - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-423
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-424
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-425
SMITH ISLAND - VERIZON MARYLAND, INC.

Exchange 410-426
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-427
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-428
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-429
Reisterstown - VERIZON MARYLAND, INC.

Exchange 410-430
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-431
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-432
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-433
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-434
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-435
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-436
EDGEWOOD - VERIZON MARYLAND, INC.

Exchange 410-437
ARMIGER - VERIZON MARYLAND, INC.

Exchange 410-438
SUDLERSVILLE - VERIZON MARYLAND, INC.

Exchange 410-439
ARMIGER - VERIZON MARYLAND, INC.

Exchange 410-440
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-441
Elkton - COMCAST CELLULAR COMMUNICATIONS - MARYLAND

Exchange 410-442
GLENWOOD - VERIZON MARYLAND, INC.

Exchange 410-443
- LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 410-444
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-445
- METROCALL

Exchange 410-446
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-447
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-448
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-449
Pikesville - WEBLINK WIRELESS, INC.

Exchange 410-450
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-451
CROFTON - VERIZON MARYLAND, INC.

Exchange 410-452
CARDIFF - VERIZON MARYLAND, INC.

Exchange 410-453
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-454
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-455
Catonsville - VERIZON MARYLAND, INC.

Exchange 410-456
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-457
DARLINGTON - VERIZON MARYLAND, INC.

Exchange 410-458
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-459
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-460
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-461
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-462
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-463
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-464
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-465
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-466
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 410-467
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-468
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-469
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-470
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-471
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-472
MANOR - VERIZON MARYLAND, INC.

Exchange 410-473
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-474
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-475
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-476
TRAPPE - VERIZON MARYLAND, INC.

Exchange 410-477
Sparrows Point - VERIZON MARYLAND, INC.

Exchange 410-478
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-479
Denton - VERIZON MARYLAND, INC.

Exchange 410-480
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-481
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-482
GREENSBORO - VERIZON MARYLAND, INC.

Exchange 410-483
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-484
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-485
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-486
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-487
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-488
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-489
GLENWOOD - VERIZON MARYLAND, INC.

Exchange 410-490
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-491
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-492
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-493
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-494
Towson - VERIZON MARYLAND, INC.

Exchange 410-495
MUTUAL - VERIZON MARYLAND, INC.

Exchange 410-496
Randallstown - VERIZON MARYLAND, INC.

Exchange 410-497
Baltimore - COMCAST BUSINESS COMMUNICATIONS, INC. - MD

Exchange 410-498
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 410-499
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-500
Fort Washington - VERIZON MARYLAND, INC.

Exchange 410-501
Baltimore - LIGHTWAVE COMMUNICATIONS, LLC - MD

Exchange 410-502
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-503
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-504
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-505
Columbia - VERIZON MARYLAND, INC.

Exchange 410-506
Elkton - VERIZON MARYLAND, INC.

Exchange 410-507
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-508
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-509
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 410-510
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-511
-

Exchange 410-512
Towson - VERIZON MARYLAND, INC.

Exchange 410-513
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-514
DORRS CORNER - VERIZON MARYLAND, INC.

Exchange 410-515
BEL AIR - VERIZON MARYLAND, INC.

Exchange 410-516
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-517
Reisterstown - VERIZON MARYLAND, INC.

Exchange 410-518
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-519
ODENTON - VERIZON MARYLAND, INC.

Exchange 410-520
OCEAN CITY - VERIZON MARYLAND, INC.

Exchange 410-521
Randallstown - VERIZON MARYLAND, INC.

Exchange 410-522
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-523
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-524
OCEAN CITY - VERIZON MARYLAND, INC.

Exchange 410-525
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-526
Reisterstown - VERIZON MARYLAND, INC.

Exchange 410-527
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-528
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-529
PERRY HALL - VERIZON MARYLAND, INC.

Exchange 410-530
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-531
Clarksville - VERIZON MARYLAND, INC.

Exchange 410-532
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-533
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-534
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-535
Prince Frederick - VERIZON MARYLAND, INC.

Exchange 410-536
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-537
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-538
EDGEWOOD - VERIZON MARYLAND, INC.

Exchange 410-539
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-540
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-541
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-542
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 410-543
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-544
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-545
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-546
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-547
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-548
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-549
SYKESVILLE - VERIZON MARYLAND, INC.

Exchange 410-550
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-551
ODENTON - VERIZON MARYLAND, INC.

Exchange 410-552
SYKESVILLE - VERIZON MARYLAND, INC.

Exchange 410-553
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-554
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-555
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-556
CHURCH HILL - VERIZON MARYLAND, INC.

Exchange 410-557
JARRETTSVILLE - VERIZON MARYLAND, INC.

Exchange 410-558
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-559
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-560
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-561
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-562
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-563
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-564
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-565
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-566
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-567
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-568
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-569
BEL AIR - VERIZON MARYLAND, INC.

Exchange 410-570
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-571
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-572
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-573
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-574
Essex - VERIZON MARYLAND, INC.

Exchange 410-575
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-576
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-577
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-578
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 410-579
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-580
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-581
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-582
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-583
Towson - VERIZON MARYLAND, INC.

Exchange 410-584
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-585
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-586
MUTUAL - VERIZON MARYLAND, INC.

Exchange 410-587
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-588
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-589
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-590
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-591
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-592
FORK - VERIZON MARYLAND, INC.

Exchange 410-593
FORK - VERIZON MARYLAND, INC.

Exchange 410-594
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-595
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-596
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-597
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-598
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-599
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-600
-

Exchange 410-601
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 410-602
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-603
SALISBURY - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-604
STEVENSVILLE - VERIZON MARYLAND, INC.

Exchange 410-605
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-606
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-607
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-608
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-609
BROOKLYN - VERIZON MARYLAND, INC.

Exchange 410-610
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-611
-

Exchange 410-612
EDGEWOOD - VERIZON MARYLAND, INC.

Exchange 410-613
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-614
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-615
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-616
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-617
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-618
Salisbury - VERIZON MARYLAND, INC.

Exchange 410-619
Laurel - VERIZON MARYLAND, INC.

Exchange 410-620
Elkton - VERIZON MARYLAND, INC.

Exchange 410-621
PRINCESS ANNE - VERIZON MARYLAND, INC.

Exchange 410-622
EASTON - METROCALL

Exchange 410-623
MARION - VERIZON MARYLAND, INC.

Exchange 410-624
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-625
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-626
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-627
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-628
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-629
BERLIN - VERIZON MARYLAND, INC.

Exchange 410-630
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-631
Dundalk - VERIZON MARYLAND, INC.

Exchange 410-632
SNOW HILL - VERIZON MARYLAND, INC.

Exchange 410-633
Dundalk - VERIZON MARYLAND, INC.

Exchange 410-634
HILLSBORO - VERIZON MARYLAND, INC.

Exchange 410-635
NEW WINDSOR - VERIZON MARYLAND, INC.

Exchange 410-636
BROOKLYN - VERIZON MARYLAND, INC.

Exchange 410-637
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-638
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-639
ROCK HALL - VERIZON MARYLAND, INC.

Exchange 410-640
- METROCALL

Exchange 410-641
BERLIN - VERIZON MARYLAND, INC.

Exchange 410-642
BAINBRIDGE - VERIZON MARYLAND, INC.

Exchange 410-643
ROMANCOKE - VERIZON MARYLAND, INC.

Exchange 410-644
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-645
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-646
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-647
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-648
GALENA - VERIZON MARYLAND, INC.

Exchange 410-649
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-650
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-651
PRINCESS ANNE - VERIZON MARYLAND, INC.

Exchange 410-652
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-653
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-654
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-655
Randallstown - VERIZON MARYLAND, INC.

Exchange 410-657
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-658
RISING SUN - ARMSTRONG TELEPHONE CO. OF MARYLAND

Exchange 410-659
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-660
-

Exchange 410-661
Parkville - VERIZON MARYLAND, INC.

Exchange 410-662
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-663
Parkville - VERIZON MARYLAND, INC.

Exchange 410-664
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 410-665
Parkville - VERIZON MARYLAND, INC.

Exchange 410-666
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-667
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-668
Parkville - VERIZON MARYLAND, INC.

Exchange 410-669
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-670
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-671
EDGEWOOD - VERIZON MARYLAND, INC.

Exchange 410-672
Odenton - VERIZON MARYLAND, INC.

Exchange 410-673
PRESTON - VERIZON MARYLAND, INC.

Exchange 410-674
ODENTON - VERIZON MARYLAND, INC.

Exchange 410-675
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-676
EDGEWOOD - VERIZON MARYLAND, INC.

Exchange 410-677
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-678
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-679
EDGEWOOD - VERIZON MARYLAND, INC.

Exchange 410-680
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-681
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-682
Essex - VERIZON MARYLAND, INC.

Exchange 410-683
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-684
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-685
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-686
Essex - VERIZON MARYLAND, INC.

Exchange 410-687
Essex - VERIZON MARYLAND, INC.

Exchange 410-688
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-689
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-690
WYE MILLS - AT&T LOCAL

Exchange 410-691
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-692
JARRETTSVILLE - VERIZON MARYLAND, INC.

Exchange 410-693
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-694
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-695
Odenton - VERIZON MARYLAND, INC.

Exchange 410-696
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-697
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-698
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-699
SALISBURY - SPRINT SPECTRUM L.P.

Exchange 410-700
-

Exchange 410-701
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-702
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-703
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-704
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-705
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-706
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-707
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-708
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-709
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-710
Baltimore -

Exchange 410-711
-

Exchange 410-712
Hanover - VERIZON MARYLAND, INC.

Exchange 410-713
- LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 410-714
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-715
Columbia - VERIZON MARYLAND, INC.

Exchange 410-716
Towson - VERIZON MARYLAND, INC.

Exchange 410-717
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-718
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-719
Catonsville - VERIZON MARYLAND, INC.

Exchange 410-720
Columbia - VERIZON MARYLAND, INC.

Exchange 410-721
CROFTON - VERIZON MARYLAND, INC.

Exchange 410-722
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-723
OCEAN CITY - VERIZON MARYLAND, INC.

Exchange 410-724
Laurel - VERIZON MARYLAND, INC.

Exchange 410-725
SALISBURY - SPRINT SPECTRUM L.P.

Exchange 410-726
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-727
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-728
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-729
DORRS CORNER - VERIZON MARYLAND, INC.

Exchange 410-730
Columbia - VERIZON MARYLAND, INC.

Exchange 410-731
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-732
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-733
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-734
CHURCHVILLE - VERIZON MARYLAND, INC.

Exchange 410-735
Baltimore - CAVALIER EAST LLC - MD

Exchange 410-736
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-737
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-738
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-739
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-740
Columbia - VERIZON MARYLAND, INC.

Exchange 410-741
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 410-742
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-743
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-744
Catonsville - VERIZON MARYLAND, INC.

Exchange 410-745
SAINT MICHAELS - VERIZON MARYLAND, INC.

Exchange 410-746
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-747
Catonsville - VERIZON MARYLAND, INC.

Exchange 410-748
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-749
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-750
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-751
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-752
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-753
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-754
Federalsburg - VERIZON MARYLAND, INC.

Exchange 410-755
CECILTON - VERIZON MARYLAND, INC.

Exchange 410-756
TANEYTOWN - VERIZON MARYLAND, INC.

Exchange 410-757
SAINT MARGARETS - VERIZON MARYLAND, INC.

Exchange 410-758
CENTREVILLE - VERIZON MARYLAND, INC.

Exchange 410-759
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-760
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-761
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-762
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-763
Easton - VERIZON MARYLAND, INC.

Exchange 410-764
Pikesville - VERIZON MARYLAND, INC.

Exchange 410-765
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-766
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-767
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-768
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-769
Towson - VERIZON MARYLAND, INC.

Exchange 410-770
Easton - VERIZON MARYLAND, INC.

Exchange 410-771
MANOR - VERIZON MARYLAND, INC.

Exchange 410-772
Columbia - VERIZON MARYLAND, INC.

Exchange 410-773
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-774
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-775
UNION BRIDGE - VERIZON MARYLAND, INC.

Exchange 410-776
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-777
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-778
Chestertown - VERIZON MARYLAND, INC.

Exchange 410-779
Baltimore - WINSTAR COMMUNICATIONS, LLC - MD

Exchange 410-780
Essex - VERIZON MARYLAND, INC.

Exchange 410-781
SYKESVILLE - VERIZON MARYLAND, INC.

Exchange 410-782
Hanover - VERIZON MARYLAND, INC.

Exchange 410-783
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-784
DEAL ISLAND - VERIZON MARYLAND, INC.

Exchange 410-785
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-786
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-787
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-788
Catonsville - VERIZON MARYLAND, INC.

Exchange 410-789
BROOKLYN - VERIZON MARYLAND, INC.

Exchange 410-790
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-791
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-792
Laurel - VERIZON MARYLAND, INC.

Exchange 410-793
CROFTON - VERIZON MARYLAND, INC.

Exchange 410-794
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-795
SYKESVILLE - VERIZON MARYLAND, INC.

Exchange 410-796
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-797
Laurel - VERIZON MARYLAND, INC.

Exchange 410-798
MAYO - VERIZON MARYLAND, INC.

Exchange 410-799
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 410-800
Baltimore - NATIONSLINE, INC.-MD

Exchange 410-801
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-802
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-803
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-804
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-805
Towson - TRI-STATE RADIO PAGING - MARYLAND

Exchange 410-806
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-807
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-808
Baltimore - NEXTEL COMMUNICATIONS

Exchange 410-809
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 410-810
Chestertown - VERIZON MARYLAND, INC.

Exchange 410-811
-

Exchange 410-812
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-813
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-814
Hanover -

Exchange 410-815
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-816
Towson - VERIZON MARYLAND, INC.

Exchange 410-817
FORK - VERIZON MARYLAND, INC.

Exchange 410-818
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-819
Easton - VERIZON MARYLAND, INC.

Exchange 410-820
Easton - VERIZON MARYLAND, INC.

Exchange 410-821
Towson - VERIZON MARYLAND, INC.

Exchange 410-822
Easton - VERIZON MARYLAND, INC.

Exchange 410-823
Towson - VERIZON MARYLAND, INC.

Exchange 410-824
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-825
Towson - VERIZON MARYLAND, INC.

Exchange 410-826
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-827
QUEENSTOWN - VERIZON MARYLAND, INC.

Exchange 410-828
Towson - VERIZON MARYLAND, INC.

Exchange 410-829
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-830
Towson - VERIZON MARYLAND, INC.

Exchange 410-831
Salisbury - VERIZON MARYLAND, INC.

Exchange 410-832
Towson - VERIZON MARYLAND, INC.

Exchange 410-833
Reisterstown - VERIZON MARYLAND, INC.

Exchange 410-834
Laurel - VERIZON MARYLAND, INC.

Exchange 410-835
WILLARDS - VERIZON MARYLAND, INC.

Exchange 410-836
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-837
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-838
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-839
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-840
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-841
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-842
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-843
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-844
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-845
SALISBURY - SPRINT SPECTRUM L.P.

Exchange 410-846
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-847
Towson - VERIZON MARYLAND, INC.

Exchange 410-848
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-849
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-850
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-851
Towson - VERIZON MARYLAND, INC.

Exchange 410-852
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-853
Towson - VERIZON MARYLAND, INC.

Exchange 410-854
ODENTON - VERIZON MARYLAND, INC.

Exchange 410-855
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-856
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-857
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-858
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-859
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-860
SALISBURY - VERIZON MARYLAND, INC.

Exchange 410-861
Reisterstown - VERIZON MARYLAND, INC.

Exchange 410-862
Laurel - VERIZON MARYLAND, INC.

Exchange 410-863
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-864
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-865
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-866
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-867
GALESVILLE - VERIZON MARYLAND, INC.

Exchange 410-868
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-869
Catonsville - VERIZON MARYLAND, INC.

Exchange 410-870
- COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD

Exchange 410-871
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-872
Columbia - VERIZON MARYLAND, INC.

Exchange 410-873
NANTICOKE - VERIZON MARYLAND, INC.

Exchange 410-874
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-875
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-876
WESTMINSTER - VERIZON MARYLAND, INC.

Exchange 410-877
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-878
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-879
CHURCHVILLE - VERIZON MARYLAND, INC.

Exchange 410-880
Laurel - VERIZON MARYLAND, INC.

Exchange 410-881
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-882
Parkville - VERIZON MARYLAND, INC.

Exchange 410-883
SHARPTOWN - VERIZON MARYLAND, INC.

Exchange 410-884
Columbia - VERIZON MARYLAND, INC.

Exchange 410-885
CHESAPEAKE CITY - VERIZON MARYLAND, INC.

Exchange 410-886
TILGHMAN - VERIZON MARYLAND, INC.

Exchange 410-887
Towson - VERIZON MARYLAND, INC.

Exchange 410-888
Laurel - VERIZON MARYLAND, INC.

Exchange 410-889
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-890
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-891
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 410-892
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-893
Bel Air - VERIZON MARYLAND, INC.

Exchange 410-894
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-895
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-896
Delmar - VERIZON MARYLAND, INC.

Exchange 410-897
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-898
Beltsville - VERIZON MARYLAND, INC.

Exchange 410-899
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-900
Baltimore - CTC COMMUNICATIONS - MD

Exchange 410-901
Cambridge - VERIZON MARYLAND, INC.

Exchange 410-902
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-903
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-904
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-905
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-906
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-907
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-908
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-909
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-910
Bel Air - MCIMETRO, ATS, INC.

Exchange 410-911
-

Exchange 410-912
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 410-913
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-914
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 410-915
Laurel - PAETEC COMMUNICATIONS, INC. - MD

Exchange 410-916
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-917
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-918
Essex - VERIZON MARYLAND, INC.

Exchange 410-919
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-920
Elkton - COMCAST CELLULAR COMMUNICATIONS - MARYLAND

Exchange 410-921
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-922
Randallstown - VERIZON MARYLAND, INC.

Exchange 410-923
DORRS CORNER - VERIZON MARYLAND, INC.

Exchange 410-924
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-925
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-926
Columbia - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-927
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 410-928
MILLINGTON - VERIZON MARYLAND, INC.

Exchange 410-929
Cockeysville - VERIZON MARYLAND, INC.

Exchange 410-930
Laurel - R. F. COMMUNICATIONS

Exchange 410-931
WHITE MARSH - VERIZON MARYLAND, INC.

Exchange 410-932
- ARCH WIRELESS HOLDINGS, INC.

Exchange 410-933
WHITE MARSH - VERIZON MARYLAND, INC.

Exchange 410-934
Laurel - VERIZON MARYLAND, INC.

Exchange 410-935
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-936
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-937
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-938
Towson - VERIZON MARYLAND, INC.

Exchange 410-939
Havre De Grace - VERIZON MARYLAND, INC.

Exchange 410-940
Baltimore - ATX TELECOMMUNICATIONS SERVICES, LTD

Exchange 410-941
JARRETTSVILLE - VERIZON MARYLAND, INC.

Exchange 410-942
Havre De Grace - VERIZON MARYLAND, INC.

Exchange 410-943
HURLOCK - VERIZON MARYLAND, INC.

Exchange 410-944
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-945
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-946
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-947
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-948
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-949
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-950
-

Exchange 410-951
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-952
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-953
Columbia - VERIZON MARYLAND, INC.

Exchange 410-954
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-955
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-956
MAYO - VERIZON MARYLAND, INC.

Exchange 410-957
POCOMOKE CITY - VERIZON MARYLAND, INC.

Exchange 410-958
-

Exchange 410-959
-

Exchange 410-960
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-961
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-962
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-963
Hanover - SPRINT SPECTRUM L.P.

Exchange 410-964
Columbia - VERIZON MARYLAND, INC.

Exchange 410-965
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-966
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 410-967
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-968
Crisfield - VERIZON MARYLAND, INC.

Exchange 410-969
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 410-970
Baltimore - MCIMETRO, ATS, INC.

Exchange 410-971
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-972
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 410-973
- AQUIS COMMUNICATIONS, INC.

Exchange 410-974
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-975
Severna Park - VERIZON MARYLAND, INC.

Exchange 410-976
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 410-977
Baltimore - NEXTEL COMMUNICATIONS

Exchange 410-978
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-979
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 410-980
Baltimore - GLOBAL NAPS, INC.

Exchange 410-981
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-982
Baltimore - QUANTUM TELECOMMUNICATIONS, INC. - MD

Exchange 410-983
CARDIFF - VERIZON MARYLAND, INC.

Exchange 410-984
Baltimore - NEXTEL COMMUNICATIONS

Exchange 410-985
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 410-986
Baltimore - VERIZON MARYLAND, INC.

Exchange 410-987
DORRS CORNER - VERIZON MARYLAND, INC.

Exchange 410-988
Clarksville - VERIZON MARYLAND, INC.

Exchange 410-989
CHURCHVILLE - VERIZON MARYLAND, INC.

Exchange 410-990
Annapolis - VERIZON MARYLAND, INC.

Exchange 410-991
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 410-992
Ellicott City - VERIZON MARYLAND, INC.

Exchange 410-993
BALT WA INTL ARPT - VERIZON MARYLAND, INC.

Exchange 410-994
ABERDEEN - VERIZON MARYLAND, INC.

Exchange 410-995
Columbia - VERIZON MARYLAND, INC.

Exchange 410-996
Elkton - VERIZON MARYLAND, INC.

Exchange 410-997
Columbia - VERIZON MARYLAND, INC.

Exchange 410-998
Owings Mills - VERIZON MARYLAND, INC.

Exchange 410-999
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT