Information for Area Code: 443-xxx-xxxx - MD - MARYLAND

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Information about Area Code 443

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

Retrieved from "http://en.wikipedia.org/wiki/Area_codes_410_and_443"

Exchanges for Area Code 443-xxx-xxxx:

Exchange 443-200
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-201
- METROCALL

Exchange 443-203
MAYO - VERIZON MARYLAND, INC.

Exchange 443-204
Columbia - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-205
Salisbury - NEXTEL BOOST INVESTMENT, INC.

Exchange 443-206
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-207
Baltimore - OMNIPOINT COMMUNICATIONS ENTERPRISES, L.P.

Exchange 443-209
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-210
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-211
-

Exchange 443-212
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-213
Owings Mills - VERIZON MARYLAND, INC.

Exchange 443-214
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-215
Easton - CORE COMMUNICATIONS, INC. - MD

Exchange 443-216
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-217
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-218
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-219
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-220
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-221
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-222
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-223
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-224
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 443-225
Easton - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-226
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-227
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-228
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-229
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-230
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-231
Baltimore - AT&T LOCAL

Exchange 443-232
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-233
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-234
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-235
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-236
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-237
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-238
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-239
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-241
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-242
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-243
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-244
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-245
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-246
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-247
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-248
-

Exchange 443-249
ROMANCOKE - VERIZON MARYLAND, INC.

Exchange 443-250
Baltimore - NEXTEL COMMUNICATIONS

Exchange 443-252
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-253
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-254
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-255
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-256
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-257
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-258
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-259
Columbia - VERIZON MARYLAND, INC.

Exchange 443-260
SALISBURY - VERIZON MARYLAND, INC.

Exchange 443-261
Hanover - SBC TELECOM, INC. - MD

Exchange 443-262
CENTREVILLE - VERIZON MARYLAND, INC.

Exchange 443-263
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-264
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-265
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-266
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-267
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-268
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-269
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-270
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-271
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-272
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-273
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-274
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 443-275
Baltimore - WINSTAR COMMUNICATIONS, LLC - MD

Exchange 443-276
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-277
Baltimore - NEXTEL COMMUNICATIONS

Exchange 443-278
Laurel - VDL, INC. DBA GLOBAL TELECOM BROKERS - MD

Exchange 443-279
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-280
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-281
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-282
Easton - NEXTEL COMMUNICATIONS

Exchange 443-283
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-284
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-285
Columbia - VERIZON MARYLAND, INC.

Exchange 443-286
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-287
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-288
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-289
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-290
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-291
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-292
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-293
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-294
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-295
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-296
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-297
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-298
Salisbury - AT&T WIRELESS SERVICES, INC.

Exchange 443-299
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-300
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-302
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-303
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-304
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-305
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-306
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-307
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-308
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-309
Baltimore - NEXTEL COMMUNICATIONS

Exchange 443-310
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-311
-

Exchange 443-312
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-313
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-314
Hanover - SBC TELECOM, INC. - MD

Exchange 443-315
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-316
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-317
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-318
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-319
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-320
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-321
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-322
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-323
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-324
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-325
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-326
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-327
- CAVALIER EAST LLC - MD

Exchange 443-328
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-329
Washington - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-330
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-331
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-332
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-334
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-335
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-336
Annapolis - NEXTEL COMMUNICATIONS

Exchange 443-337
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-338
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-339
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-340
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-341
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-342
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-343
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-344
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-345
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-346
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-347
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-348
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-349
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-350
North East - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-351
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-352
Baltimore - AT&T LOCAL

Exchange 443-353
Cockeysville - VERIZON MARYLAND, INC.

Exchange 443-354
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-355
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-356
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-357
Pikesville - VERIZON MARYLAND, INC.

Exchange 443-359
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-360
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-361
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-362
Salisbury - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-363
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-364
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-365
Salisbury - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-366
SALISBURY - SPRINT SPECTRUM L.P.

Exchange 443-367
Columbia - VERIZON MARYLAND, INC.

Exchange 443-368
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-369
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-370
Columbia - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-371
Baltimore - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-372
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-373
SALISBURY - SPRINT SPECTRUM L.P.

Exchange 443-374
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-375
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-376
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-378
Hanover - NEXTEL BOOST INVESTMENT, INC.

Exchange 443-379
-

Exchange 443-380
Baltimore - WINSTAR COMMUNICATIONS, LLC - MD

Exchange 443-381
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-382
Easton - CORE COMMUNICATIONS, INC. - MD

Exchange 443-383
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-384
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-385
Easton - CORE COMMUNICATIONS, INC. - MD

Exchange 443-386
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-387
Easton - CORE COMMUNICATIONS, INC. - MD

Exchange 443-388
- METROCALL

Exchange 443-389
Easton - CORE COMMUNICATIONS, INC. - MD

Exchange 443-390
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-391
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-392
Baltimore - AT&T LOCAL

Exchange 443-393
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-394
Owings Mills - VERIZON MARYLAND, INC.

Exchange 443-396
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-398
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-399
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-400
Baltimore - XO MARYLAND, LLC

Exchange 443-402
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-403
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-404
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-405
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-406
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-407
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-408
Baltimore - XO MARYLAND, LLC

Exchange 443-409
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-410
-

Exchange 443-411
-

Exchange 443-412
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-413
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-414
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-415
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-416
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-417
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-418
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-419
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-420
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-421
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-423
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-424
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-425
Baltimore - AT&T LOCAL

Exchange 443-426
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-427
Easton - CORE COMMUNICATIONS, INC. - MD

Exchange 443-428
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-429
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-430
Baltimore - XO MARYLAND, LLC

Exchange 443-431
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-432
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-433
Baltimore - XO MARYLAND, LLC

Exchange 443-434
- NATIONSLINE, INC.-MD

Exchange 443-435
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-436
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 443-437
- NATIONSLINE, INC.-MD

Exchange 443-439
- NATIONSLINE, INC.-MD

Exchange 443-440
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-441
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-442
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-443
-

Exchange 443-444
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-445
Hanover - SBC TELECOM, INC. - MD

Exchange 443-446
- NATIONSLINE, INC.-MD

Exchange 443-448
- NATIONSLINE, INC.-MD

Exchange 443-449
-

Exchange 443-450
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-451
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-452
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-454
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-455
Pikesville -

Exchange 443-456
Baltimore - AT&T LOCAL

Exchange 443-457
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-458
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-459
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-460
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-461
- US LEC OF MARYLAND, INC.

Exchange 443-463
Baltimore - NEXTEL COMMUNICATIONS

Exchange 443-464
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-465
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-466
Baltimore - SPRINT SPECTRUM L.P.

Exchange 443-468
Hanover -

Exchange 443-471
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-472
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-473
Hanover -

Exchange 443-474
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-475
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-476
Annapolis - VERIZON MARYLAND, INC.

Exchange 443-477
- METROCALL

Exchange 443-479
LAUREL - VERIZON MARYLAND, INC.

Exchange 443-480
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-481
Annapolis - VERIZON MARYLAND, INC.

Exchange 443-482
Annapolis - VERIZON MARYLAND, INC.

Exchange 443-483
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-484
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-485
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-486
Annapolis - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-487
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-488
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-489
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-490
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-491
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-492
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-494
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-495
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-496
Easton - NEXTEL COMMUNICATIONS

Exchange 443-497
Salisbury - NEXTEL COMMUNICATIONS

Exchange 443-498
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-499
- GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-501
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-502
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-503
Baltimore - XO MARYLAND, LLC

Exchange 443-504
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-505
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-506
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-507
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-508
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-511
-

Exchange 443-512
BEL AIR - VERIZON MARYLAND, INC.

Exchange 443-513
SALISBURY - DOBSON CELLULAR SYSTEMS, INC.

Exchange 443-514
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-515
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-516
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-517
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-519
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-520
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-521
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-522
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-523
SALISBURY - VERIZON MARYLAND, INC.

Exchange 443-524
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-526
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-527
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-528
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-530
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-532
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-533
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-534
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-535
Clarksville - VERIZON MARYLAND, INC.

Exchange 443-536
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-538
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-539
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-540
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-541
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-542
- COMCAST BUSINESS COMMUNICATIONS, INC. - MD

Exchange 443-543
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-544
- CAVALIER EAST LLC - MD

Exchange 443-545
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-546
Columbia - VERIZON MARYLAND, INC.

Exchange 443-548
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-549
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-550
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-551
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-552
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-553
North East - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-554
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-555
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-556
Cockeysville - VERIZON MARYLAND, INC.

Exchange 443-557
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-558
Baltimore - XO MARYLAND, LLC

Exchange 443-559
Baltimore - COMCAST BUSINESS COMMUNICATIONS, INC. - MD

Exchange 443-560
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-561
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-562
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-563
Hanover -

Exchange 443-564
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-565
- CAVALIER EAST LLC - MD

Exchange 443-566
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-567
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-568
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-569
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-570
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-572
Glen Burnie - VERIZON MARYLAND, INC.

Exchange 443-573
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-574
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-575
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-576
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-577
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-578
Baltimore - XO MARYLAND, LLC

Exchange 443-579
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-581
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-582
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-583
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-584
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-585
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-586
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-587
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-588
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-589
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-590
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-591
Hanover - SBC TELECOM, INC. - MD

Exchange 443-592
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-593
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-594
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-595
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-596
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-597
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-598
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-599
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-600
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-601
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-602
-

Exchange 443-603
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-604
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-605
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-606
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-607
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-609
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-610
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-611
-

Exchange 443-612
Catonsville - VERIZON MARYLAND, INC.

Exchange 443-614
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-615
-

Exchange 443-616
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-617
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-618
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-620
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-621
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-622
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-623
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-624
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-625
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-626
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-627
Baltimore -

Exchange 443-628
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-629
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-631
Columbia - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-632
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-633
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-634
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-636
Hanover - SBC TELECOM, INC. - MD

Exchange 443-637
Baltimore - XO MARYLAND, LLC

Exchange 443-638
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-639
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-640
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-641
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-642
-

Exchange 443-643
Bel Air - VERIZON MARYLAND, INC.

Exchange 443-644
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-645
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-646
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-647
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-648
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-649
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-650
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-652
Towson - VERIZON MARYLAND, INC.

Exchange 443-653
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-655
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-656
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-657
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-658
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-659
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-660
- TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-661
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-662
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-663
WOODLAWN - VERIZON MARYLAND, INC.

Exchange 443-664
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-665
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-666
Baltimore - ARBROS COMMUNICATIONS LICENSING COMPANY, N.E. - MD

Exchange 443-667
-

Exchange 443-668
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-669
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-670
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-671
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-672
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-673
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-674
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-675
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-676
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-677
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-678
WHITE MARSH - VERIZON MARYLAND, INC.

Exchange 443-679
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-682
-

Exchange 443-683
-

Exchange 443-685
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-686
Hanover - NEXTEL BOOST INVESTMENT, INC.

Exchange 443-687
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-688
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-689
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-690
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-691
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-692
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-693
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-694
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-695
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-696
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-697
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-698
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-699
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-700
-

Exchange 443-701
Baltimore - XO MARYLAND, LLC

Exchange 443-702
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-703
Baltimore - XO MARYLAND, LLC

Exchange 443-704
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-705
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-706
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-707
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-708
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-709
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-710
Baltimore - XO MARYLAND, LLC

Exchange 443-711
-

Exchange 443-712
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-714
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-715
Bel Air - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-716
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-717
-

Exchange 443-719
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-720
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-722
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-723
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-724
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-725
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-726
Chantilly - TIDALWAVE TELEPHONE INC.

Exchange 443-727
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-728
SALISBURY - CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD

Exchange 443-729
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-730
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-731
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-732
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-733
Baltimore - AT&T LOCAL

Exchange 443-734
ODENTON - VERIZON MARYLAND, INC.

Exchange 443-735
Easton - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-736
EASTON - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-737
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-738
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-739
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-740
Baltimore - ADELPHIA BUSINESS SOLUTIONS OF MARYLAND, LLC

Exchange 443-742
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-744
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-745
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-746
- LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-747
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-748
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-749
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-750
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-751
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-752
Baltimore - GLOBAL NAPS, INC. - NY

Exchange 443-753
WASHINGTON - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-755
ELKRIDGE - VERIZON MARYLAND, INC.

Exchange 443-756
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-757
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-758
Baltimore - AT&T LOCAL

Exchange 443-760
Baltimore - AT&T LOCAL

Exchange 443-762
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-763
Baltimore - WINSTAR COMMUNICATIONS, LLC - MD

Exchange 443-765
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-766
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-767
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-768
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-770
ARMIGER - VERIZON MARYLAND, INC.

Exchange 443-772
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-773
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-774
Baltimore - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-775
Baltimore - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-776
Baltimore - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-777
Essex - VERIZON MARYLAND, INC.

Exchange 443-778
Laurel - VERIZON MARYLAND, INC.

Exchange 443-779
Baltimore - GLOBAL NAPS, INC. - NY

Exchange 443-780
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-781
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-782
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-783
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-784
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-785
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-786
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-787
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-788
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-789
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-790
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-791
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-793
Baltimore - XO MARYLAND, LLC

Exchange 443-794
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-795
Baltimore - XO MARYLAND, LLC

Exchange 443-796
Baltimore - XO MARYLAND, LLC

Exchange 443-797
Baltimore - XO MARYLAND, LLC

Exchange 443-798
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-799
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-801
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-802
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-803
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-804
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-806
Hanover -

Exchange 443-807
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-808
Baltimore - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-809
Baltimore - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-811
-

Exchange 443-812
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-815
Baltimore - XO MARYLAND, LLC

Exchange 443-816
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-817
Baltimore - ALLEGIANCE TELECOM, INC. - MD

Exchange 443-818
Baltimore -

Exchange 443-819
Baltimore - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-820
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-822
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-823
-

Exchange 443-824
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-825
Baltimore -

Exchange 443-827
Windsor Mill - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-828
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-829
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-830
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-831
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-832
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-833
Hanover - SBC TELECOM, INC. - MD

Exchange 443-834
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-836
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-837
Columbia - US LEC OF MARYLAND, INC.

Exchange 443-838
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-839
Baltimore -

Exchange 443-840
Columbia - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-841
Cockeysville - VERIZON MARYLAND, INC.

Exchange 443-843
Havre De Grace - VERIZON MARYLAND, INC.

Exchange 443-844
-

Exchange 443-845
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-846
Hanover - SBC TELECOM, INC. - MD

Exchange 443-847
-

Exchange 443-848
Hanover - SBC TELECOM, INC. - MD

Exchange 443-849
Towson - VERIZON MARYLAND, INC.

Exchange 443-850
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-851
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-852
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-854
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-855
- LIGHTWAVE COMMUNICATIONS, LLC - MD

Exchange 443-856
Salisbury - CORE COMMUNICATIONS, INC. - MD

Exchange 443-857
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-858
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-859
Salisbury - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-860
Columbia - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-862
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-864
Hanover - NEXTEL COMMUNICATIONS

Exchange 443-865
Baltimore - NEXTEL COMMUNICATIONS

Exchange 443-866
Hanover - SPRINT SPECTRUM L.P.

Exchange 443-867
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-868
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-869
-

Exchange 443-870
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 443-871
Annapolis - NEXTEL COMMUNICATIONS

Exchange 443-872
Hanover - SBC TELECOM, INC. - MD

Exchange 443-874
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-875
Hanover - SBC TELECOM, INC. - MD

Exchange 443-876
Hanover - SBC TELECOM, INC. - MD

Exchange 443-877
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-878
Hanover - SBC TELECOM, INC. - MD

Exchange 443-879
Hanover - SBC TELECOM, INC. - MD

Exchange 443-880
WYE MILLS - AT&T LOCAL

Exchange 443-881
Hanover -

Exchange 443-883
Baltimore - AT&T LOCAL

Exchange 443-884
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-885
BALTIMORE - VERIZON MARYLAND, INC.

Exchange 443-886
Baltimore - AT&T LOCAL

Exchange 443-889
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-891
Baltimore - XO MARYLAND, LLC

Exchange 443-893
Baltimore - XO MARYLAND, LLC

Exchange 443-895
-

Exchange 443-896
Baltimore - AT&T LOCAL

Exchange 443-898
Pikesville -

Exchange 443-899
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-900
-

Exchange 443-901
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-904
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-907
North East - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-909
-

Exchange 443-910
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-911
-

Exchange 443-912
Baltimore - CORE COMMUNICATIONS, INC. - MD

Exchange 443-914
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-918
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-919
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-920
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-921
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-922
Baltimore -

Exchange 443-923
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-925
Baltimore -

Exchange 443-926
Annapolis - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-927
Baltimore - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 443-928
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 443-929
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-933
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-935
Hanover -

Exchange 443-936
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-937
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-939
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-940
Hanover - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 443-941
- ADELPHIA BUSINESS SOLUTIONS OF MARYLAND, LLC

Exchange 443-942
Columbia - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-943
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-944
-

Exchange 443-945
Elkton - AT&T WIRELESS SERVICES, INC.

Exchange 443-946
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-947
Baltimore - GLOBAL NAPS SOUTH, INC. - MD

Exchange 443-949
-

Exchange 443-950
-

Exchange 443-951
BALTIMORE - GLOBAL CROSSING LOCAL SERVICES, INC.-MD

Exchange 443-954
Baltimore - PAETEC COMMUNICATIONS, INC. - MD

Exchange 443-955
-

Exchange 443-956
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-957
Baltimore - AT&T LOCAL

Exchange 443-958
-

Exchange 443-959
-

Exchange 443-964
Baltimore -

Exchange 443-965
Hanover -

Exchange 443-966
-

Exchange 443-967
North East - VERIZON MARYLAND, INC.

Exchange 443-968
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-969
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-971
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-973
Baltimore - XO MARYLAND, LLC

Exchange 443-974
Baltimore - TELEPORT COMMUNICATIONS GROUP AMERICA, INC. - MD

Exchange 443-975
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-976
Laurel -

Exchange 443-977
-

Exchange 443-980
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-982
-

Exchange 443-983
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-984
Baltimore - VERIZON MARYLAND, INC.

Exchange 443-985
Baltimore - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 443-986
-

Exchange 443-987
Baltimore - AT&T LOCAL

Exchange 443-988
-

Exchange 443-989
Baltimore - CAVALIER EAST LLC - MD

Exchange 443-992
Baltimore - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 443-994
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-995
Columbia - AT&T WIRELESS SERVICES, INC.

Exchange 443-996
Hanover - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 443-997
- VERIZON MARYLAND, INC.

Exchange 443-998
Linthicum Heights - BROADSTREET COMMUNICATIONS, INC. - MD

Exchange 443-999
Baltimore - VERIZON MARYLAND, INC.