Information for Area Code: 301-xxx-xxxx - MD - MARYLAND

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Information about Area Code 301

The blue area is Maryland; the red area is area codes 240 and 301

North American area codes 240 and 301 are state of Maryland telephone area codes which serve Maryland's portion of the Greater Washington, D.C. metro area, portions of Southern Maryland, and all points northwest of Washington. This includes the communities of Cumberland, Frederick, Hagerstown, and Rockville. Area code 301 was one of the original area codes established in 1947, and was the exclusive area code for the entire state of Maryland until it was split with 410 on October 6, 1991. The overlay area code, 240, was introduced on June 1, 1997.

Counties served by these area codes include:

local calls require 10-digit dialing (area code + number, leading "1" is not required)


State of Maryland Area Codes: 240, 301, 410, 443
North: 717, 724/878, 814
West: 202, 304, 540, 571/703 area codes 301/240 East: 410/443
South: 804, 304
District of Columbia Area Code: 202
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
State of West Virginia Area Code: 304


See also


Exchanges for Area Code 301-xxx-xxxx:

Exchange 301-201
-

Exchange 301-203
Fort Washington - VERIZON MARYLAND, INC.

Exchange 301-204
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-205
MAYO - VERIZON MARYLAND, INC.

Exchange 301-206
Laurel - VERIZON MARYLAND, INC.

Exchange 301-207
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-208
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-209
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-210
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-211
-

Exchange 301-212
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-213
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-214
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-215
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-216
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-217
Rockville - VERIZON MARYLAND, INC.

Exchange 301-218
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-219
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-220
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-221
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-222
HERNDON - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 301-223
Williamsport - VERIZON MARYLAND, INC.

Exchange 301-224
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-225
Suitland - GEOTEK COMMUNICATIONS, INC.

Exchange 301-226
Landover - VERIZON MARYLAND, INC.

Exchange 301-227
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-228
Frederick - VERIZON MARYLAND, INC.

Exchange 301-229
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-230
Rockville - VERIZON MARYLAND, INC.

Exchange 301-231
Rockville - VERIZON MARYLAND, INC.

Exchange 301-232
Baltimore - MCIMETRO, ATS, INC.

Exchange 301-233
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-234
ALLENTOWN - VERIZON MARYLAND, INC.

Exchange 301-235
Washington - MCIMETRO, ATS, INC.

Exchange 301-236
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-237
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-238
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-239
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-240
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-241
Cascade - VERIZON MARYLAND, INC.

Exchange 301-242
Washington - MCIMETRO, ATS, INC.

Exchange 301-243
BETHESDA -

Exchange 301-244
Chevy Chase - ADELPHIA BUSINESS SOLUTIONS OF MARYLAND, LLC

Exchange 301-245
BITTINGER - VERIZON MARYLAND, INC.

Exchange 301-246
NANJEMOY - VERIZON MARYLAND, INC.

Exchange 301-247
HOLLYWOOD - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-248
ALLENTOWN - VERIZON MARYLAND, INC.

Exchange 301-249
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-250
Baltimore - MCIMETRO, ATS, INC.

Exchange 301-251
Rockville - VERIZON MARYLAND, INC.

Exchange 301-252
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-253
DAMASCUS - VERIZON MARYLAND, INC.

Exchange 301-254
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-255
Rockville - VERIZON MARYLAND, INC.

Exchange 301-256
Baltimore - MCIMETRO, ATS, INC.

Exchange 301-257
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-258
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-259
TOMPKINSVILLE - VERIZON MARYLAND, INC.

Exchange 301-260
Olney - VERIZON MARYLAND, INC.

Exchange 301-261
Annapolis - VERIZON MARYLAND, INC.

Exchange 301-262
Bowie - VERIZON MARYLAND, INC.

Exchange 301-263
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-264
MOUNT SAVAGE - VERIZON MARYLAND, INC.

Exchange 301-265
ALLENTOWN - VERIZON MARYLAND, INC.

Exchange 301-266
- AT&T WIRELESS SERVICES, INC.

Exchange 301-267
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-268
Cumberland - USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD

Exchange 301-269
DAMASCUS - METROCALL

Exchange 301-270
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-271
THURMONT - VERIZON MARYLAND, INC.

Exchange 301-272
Baltimore - MCIMETRO, ATS, INC.

Exchange 301-273
Baltimore - MCIMETRO, ATS, INC.

Exchange 301-274
HUGHESVILLE - VERIZON MARYLAND, INC.

Exchange 301-275
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-276
Rockville - MCIMETRO, ATS, INC.

Exchange 301-277
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-278
Baltimore - MCIMETRO, ATS, INC.

Exchange 301-279
Rockville - VERIZON MARYLAND, INC.

Exchange 301-280
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-281
Rockville - MCIMETRO, ATS, INC.

Exchange 301-282
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-283
BRYANS ROAD - VERIZON MARYLAND, INC.

Exchange 301-284
Rockville - MCIMETRO, ATS, INC.

Exchange 301-285
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-286
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-287
Rockville - MCIMETRO, ATS, INC.

Exchange 301-288
Rockville - MCIMETRO, ATS, INC.

Exchange 301-289
Rockville - MCIMETRO, ATS, INC.

Exchange 301-290
MECHANICSVILLE - VERIZON MARYLAND, INC.

Exchange 301-291
Rockville - MCIMETRO, ATS, INC.

Exchange 301-292
Fort Washington - VERIZON MARYLAND, INC.

Exchange 301-293
MYERSVILLE - VERIZON MARYLAND, INC.

Exchange 301-294
Rockville - VERIZON MARYLAND, INC.

Exchange 301-295
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-296
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-297
ALLENTOWN - VERIZON MARYLAND, INC.

Exchange 301-298
Washington - MCIMETRO, ATS, INC.

Exchange 301-299
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-300
Annapolis Junction -

Exchange 301-301
-

Exchange 301-302
Frederick - NATIONSLINE, INC.-MD

Exchange 301-303
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-304
-

Exchange 301-305
Hagerstown - SPRINT SPECTRUM L.P.

Exchange 301-306
Lanham - VERIZON MARYLAND, INC.

Exchange 301-307
Columbia - VERIZON MARYLAND, INC.

Exchange 301-308
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-309
Rockville - VERIZON MARYLAND, INC.

Exchange 301-310
Columbia - VERIZON MARYLAND, INC.

Exchange 301-311
-

Exchange 301-312
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-313
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-314
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-315
Rockville - VERIZON MARYLAND, INC.

Exchange 301-316
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-317
Laurel - VERIZON MARYLAND, INC.

Exchange 301-318
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-319
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-320
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-321
Chevy Chase - ADELPHIA BUSINESS SOLUTIONS OF MARYLAND, LLC

Exchange 301-322
Landover - VERIZON MARYLAND, INC.

Exchange 301-323
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 301-324
CAPITOL HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-325
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-326
Beltsville - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 301-327
Pikesville -

Exchange 301-328
-

Exchange 301-329
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-330
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-331
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-332
Washington - AT&T WIRELESS SERVICES, INC.

Exchange 301-333
CAPITOL HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-334
Oakland - VERIZON MARYLAND, INC.

Exchange 301-335
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-336
CAPITOL HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-337
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-338
-

Exchange 301-339
HERNDON - CAVALIER TELEPHONE MID-ATLANTIC. LLC - MD

Exchange 301-340
Rockville - VERIZON MARYLAND, INC.

Exchange 301-341
Landover - VERIZON MARYLAND, INC.

Exchange 301-342
PATUXENT NAVAL AIR TEST C - VERIZON MARYLAND, INC.

Exchange 301-343
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-344
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-345
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-346
Washington - AT&T WIRELESS SERVICES, INC.

Exchange 301-347
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-348
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-349
POOLESVILLE - VERIZON MARYLAND, INC.

Exchange 301-350
CAPITOL HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-351
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-352
Bowie - VERIZON MARYLAND, INC.

Exchange 301-353
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-354
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-355
Chevy Chase -

Exchange 301-356
Laurel - VDL, INC. DBA GLOBAL TELECOM BROKERS - MD

Exchange 301-357
Adelphi -

Exchange 301-358
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-359
PIEDMONT - VERIZON MARYLAND, INC.

Exchange 301-360
Frederick - VERIZON MARYLAND, INC.

Exchange 301-361
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 301-362
Laurel - VERIZON MARYLAND, INC.

Exchange 301-363
Frederick -

Exchange 301-364
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-365
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-366
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-367
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-368
DAMASCUS - VERIZON MARYLAND, INC.

Exchange 301-369
Laurel - VERIZON MARYLAND, INC.

Exchange 301-370
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-371
BRADDOCK HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-372
BRANDYWINE - VERIZON MARYLAND, INC.

Exchange 301-373
HOLLYWOOD - VERIZON MARYLAND, INC.

Exchange 301-374
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-375
BRYANS ROAD - VERIZON MARYLAND, INC.

Exchange 301-376
Laurel - VERIZON MARYLAND, INC.

Exchange 301-377
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-378
-

Exchange 301-379
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-380
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-381
-

Exchange 301-382
Rockville - VERIZON MARYLAND, INC.

Exchange 301-383
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-384
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-385
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-386
Landover - VERIZON MARYLAND, INC.

Exchange 301-387
THAYERVILLE - VERIZON MARYLAND, INC.

Exchange 301-388
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-389
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 301-390
Bowie - VERIZON MARYLAND, INC.

Exchange 301-391
DAMASCUS - VERIZON MARYLAND, INC.

Exchange 301-392
LA PLATA - VERIZON MARYLAND, INC.

Exchange 301-393
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-394
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-395
Baltimore - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-396
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-397
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-398
Rockville - VERIZON MARYLAND, INC.

Exchange 301-399
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-401
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-402
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-403
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-404
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-405
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-406
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-407
POOLESVILLE - VERIZON MARYLAND, INC.

Exchange 301-408
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-409
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-410
-

Exchange 301-411
-

Exchange 301-412
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-413
Rockville - VERIZON MARYLAND, INC.

Exchange 301-414
DAMASCUS - VERIZON MARYLAND, INC.

Exchange 301-415
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-416
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-417
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-418
Frederick - VERIZON MARYLAND, INC.

Exchange 301-419
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-420
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-421
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-422
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-423
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-424
Rockville - VERIZON MARYLAND, INC.

Exchange 301-425
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-426
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-427
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-428
POOLESVILLE - VERIZON MARYLAND, INC.

Exchange 301-429
Lanham - VERIZON MARYLAND, INC.

Exchange 301-430
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-431
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-432
Keedysville - VERIZON MARYLAND, INC.

Exchange 301-433
ALLENTOWN - VERIZON MARYLAND, INC.

Exchange 301-434
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-435
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-436
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-437
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-438
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-439
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-440
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-441
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-442
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-443
Rockville - VERIZON MARYLAND, INC.

Exchange 301-444
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-445
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-446
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-447
EMMITSBURG - VERIZON MARYLAND, INC.

Exchange 301-448
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-449
ALLENTOWN - VERIZON MARYLAND, INC.

Exchange 301-450
-

Exchange 301-451
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-452
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-453
KITZMILLER - VERIZON MARYLAND, INC.

Exchange 301-454
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-455
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-456
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-457
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-458
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-459
Lanham - VERIZON MARYLAND, INC.

Exchange 301-460
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-461
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-462
Hagerstown - SPRINT SPECTRUM L.P. - MD

Exchange 301-463
Lonaconing - VERIZON MARYLAND, INC.

Exchange 301-464
Bowie - VERIZON MARYLAND, INC.

Exchange 301-465
Hagerstown - SPRINT SPECTRUM L.P. - MD

Exchange 301-466
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-467
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-468
Rockville - VERIZON MARYLAND, INC.

Exchange 301-469
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-470
Laurel - VERIZON MARYLAND, INC.

Exchange 301-471
FREDERICK - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-472
MECHANICSVILLE - VERIZON MARYLAND, INC.

Exchange 301-473
BRADDOCK HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-474
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-475
LEONARDTOWN - VERIZON MARYLAND, INC.

Exchange 301-476
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-477
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-478
OLDTOWN - VERIZON MARYLAND, INC.

Exchange 301-479
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-480
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-481
Washington - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-482
DAMASCUS - VERIZON MARYLAND, INC.

Exchange 301-483
Laurel - VERIZON MARYLAND, INC.

Exchange 301-484
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-485
Alexandria - JONES TELECOMM OF MD, INC. DBA COMCAST COMM-MD

Exchange 301-486
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-487
MYERSVILLE - VERIZON MARYLAND, INC.

Exchange 301-488
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-489
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-490
Laurel - VERIZON MARYLAND, INC.

Exchange 301-491
Frederick - USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD

Exchange 301-492
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-493
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-494
Prince Frederick - VERIZON MARYLAND, INC.

Exchange 301-495
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-496
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-497
Laurel - VERIZON MARYLAND, INC.

Exchange 301-498
Laurel - VERIZON MARYLAND, INC.

Exchange 301-499
CAPITOL HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-501
- DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-502
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-503
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-504
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-505
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-506
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-507
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-508
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-509
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-510
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-511
-

Exchange 301-512
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-513
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-514
FREDERICK - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-515
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-516
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-517
Rockville - VERIZON MARYLAND, INC.

Exchange 301-518
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-519
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-520
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-521
OXON HILL - VERIZON MARYLAND, INC.

Exchange 301-522
Rockville - VERIZON MARYLAND, INC.

Exchange 301-523
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-524
Hagerstown - SPRINT SPECTRUM L.P.

Exchange 301-525
Baltimore - QUANTUM TELECOMMUNICATIONS, INC. - MD

Exchange 301-526
Washington - AT&T WIRELESS SERVICES, INC.

Exchange 301-527
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-528
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-529
Washington - AT&T WIRELESS SERVICES, INC.

Exchange 301-530
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-531
Lanham - STARPOWER COMMUNICATIONS, LLC - MD

Exchange 301-532
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-533
Oakland - VERIZON MARYLAND, INC.

Exchange 301-534
- SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-535
Washington - AT&T WIRELESS SERVICES, INC.

Exchange 301-536
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-537
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-538
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-539
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-540
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-541
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-542
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-543
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-544
Rockville - VERIZON MARYLAND, INC.

Exchange 301-545
Rockville - VERIZON MARYLAND, INC.

Exchange 301-546
- METROCALL

Exchange 301-547
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-548
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-549
Laurel - VERIZON MARYLAND, INC.

Exchange 301-550
-

Exchange 301-551
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 301-552
Lanham - VERIZON MARYLAND, INC.

Exchange 301-553
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-554
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-555
Baltimore - VERIZON MARYLAND, INC.

Exchange 301-556
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-557
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-558
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-559
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-560
Landover - PAETEC COMMUNICATIONS, INC. - MD

Exchange 301-561
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 301-562
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-563
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-564
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-565
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-566
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-567
OXON HILL - VERIZON MARYLAND, INC.

Exchange 301-568
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-569
Baltimore - GLOBAL NAPS, INC.

Exchange 301-570
Olney - VERIZON MARYLAND, INC.

Exchange 301-571
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-572
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-573
Frederick - NEXTEL COMMUNICATIONS

Exchange 301-574
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-575
Mc Lean - US LEC OF VIRGINIA, LLC - DC

Exchange 301-576
Chevy Chase - PAETEC COMMUNICATIONS, INC. - MD

Exchange 301-577
Lanham - VERIZON MARYLAND, INC.

Exchange 301-578
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-579
BADEN - VERIZON MARYLAND, INC.

Exchange 301-580
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-581
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-582
Williamsport - VERIZON MARYLAND, INC.

Exchange 301-583
Landover - VERIZON MARYLAND, INC.

Exchange 301-584
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 301-585
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-586
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-587
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-588
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-589
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-590
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-591
Chevy Chase - PAETEC COMMUNICATIONS, INC. - MD

Exchange 301-592
SILVER SPRING - VERIZON MARYLAND, INC.

Exchange 301-593
SILVER SPRING - VERIZON MARYLAND, INC.

Exchange 301-594
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-595
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-596
Columbia - VERIZON MARYLAND, INC.

Exchange 301-597
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-598
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-599
Clinton - VERIZON MARYLAND, INC.

Exchange 301-600
Frederick -

Exchange 301-601
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-602
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-603
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-604
Laurel - VERIZON MARYLAND, INC.

Exchange 301-605
POOLESVILLE - VERIZON MARYLAND, INC.

Exchange 301-606
FREDERICK - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-607
MOUNT AIRY - VERIZON MARYLAND, INC.

Exchange 301-608
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-609
LA PLATA - VERIZON MARYLAND, INC.

Exchange 301-610
Rockville - VERIZON MARYLAND, INC.

Exchange 301-611
-

Exchange 301-612
Alexandria - METROCALL

Exchange 301-613
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-614
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-615
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-616
Cumberland - USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD

Exchange 301-617
Laurel - VERIZON MARYLAND, INC.

Exchange 301-618
Landover - VERIZON MARYLAND, INC.

Exchange 301-619
Frederick - VERIZON MARYLAND, INC.

Exchange 301-620
Frederick - VERIZON MARYLAND, INC.

Exchange 301-621
Columbia - VERIZON MARYLAND, INC.

Exchange 301-622
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-623
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-624
Frederick - VERIZON MARYLAND, INC.

Exchange 301-625
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-626
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-627
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-628
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-629
Columbia - VERIZON MARYLAND, INC.

Exchange 301-630
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-631
Frederick - VERIZON MARYLAND, INC.

Exchange 301-632
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-633
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-634
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-635
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-636
Landover - VERIZON MARYLAND, INC.

Exchange 301-637
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-638
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-639
FREDERICK - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-640
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-641
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-642
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-643
Washington - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-644
Frederick - VERIZON MARYLAND, INC.

Exchange 301-645
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-646
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-647
Laurel - VERIZON MARYLAND, INC.

Exchange 301-648
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-649
SILVER SPRING - VERIZON MARYLAND, INC.

Exchange 301-650
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-651
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-652
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-653
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-654
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-655
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-656
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-657
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-658
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-659
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-660
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-661
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-662
Frederick - VERIZON MARYLAND, INC.

Exchange 301-663
Frederick - VERIZON MARYLAND, INC.

Exchange 301-664
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-665
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-666
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-667
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-668
Frederick - VERIZON MARYLAND, INC.

Exchange 301-669
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-670
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-671
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-672
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-673
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-674
Silver Spring - NEXTEL COMMUNICATIONS

Exchange 301-675
Beltsville - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 301-676
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-677
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-678
HANCOCK - VERIZON MARYLAND, INC.

Exchange 301-679
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-680
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-681
SILVER SPRING - VERIZON MARYLAND, INC.

Exchange 301-682
Frederick - VERIZON MARYLAND, INC.

Exchange 301-683
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-684
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-685
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-686
OXON HILL - VERIZON MARYLAND, INC.

Exchange 301-687
FROSTBURG - VERIZON MARYLAND, INC.

Exchange 301-688
LAUREL - VERIZON MARYLAND, INC.

Exchange 301-689
FROSTBURG - VERIZON MARYLAND, INC.

Exchange 301-690
-

Exchange 301-691
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-692
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-693
Frederick - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 301-694
Frederick - VERIZON MARYLAND, INC.

Exchange 301-695
Frederick - VERIZON MARYLAND, INC.

Exchange 301-696
Frederick - VERIZON MARYLAND, INC.

Exchange 301-697
- DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-698
Frederick - VERIZON MARYLAND, INC.

Exchange 301-699
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-700
-

Exchange 301-701
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-702
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-703
Frederick - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-704
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-705
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-706
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-707
Cumberland - USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD

Exchange 301-708
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-709
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-710
-

Exchange 301-711
-

Exchange 301-712
Frederick -

Exchange 301-713
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-714
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-715
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-716
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-717
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-718
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-719
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-720
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-721
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-722
Cumberland - VERIZON MARYLAND, INC.

Exchange 301-723
Cumberland - VERIZON MARYLAND, INC.

Exchange 301-724
Cumberland - VERIZON MARYLAND, INC.

Exchange 301-725
Laurel - VERIZON MARYLAND, INC.

Exchange 301-726
-

Exchange 301-727
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 301-728
Beltsville - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 301-729
CRESAPTOWN - VERIZON MARYLAND, INC.

Exchange 301-730
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-731
Lanham - VERIZON MARYLAND, INC.

Exchange 301-732
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-733
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-734
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-735
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-736
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-737
LEXINGTON PARK - VERIZON MARYLAND, INC.

Exchange 301-738
Rockville - VERIZON MARYLAND, INC.

Exchange 301-739
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-740
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-741
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-742
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-743
INDIAN HEAD - VERIZON MARYLAND, INC.

Exchange 301-744
INDIAN HEAD - VERIZON MARYLAND, INC.

Exchange 301-745
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-746
FRIENDSVILLE - VERIZON MARYLAND, INC.

Exchange 301-747
Washington - TELEPORT COMMUNICATIONS GROUP, INC. - DC

Exchange 301-748
Frederick - NEXTEL COMMUNICATIONS

Exchange 301-749
OXON HILL - VERIZON MARYLAND, INC.

Exchange 301-750
- CORE COMMUNICATIONS, INC. - MD

Exchange 301-751
Washington - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-752
Washington - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-753
INDIAN HEAD - VERIZON MARYLAND, INC.

Exchange 301-754
SILVER SPRING - VERIZON MARYLAND, INC.

Exchange 301-755
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-756
Laurel - XSPEDIUS MANAGEMENT CO SWITCHES SERVICES, LLC - MD

Exchange 301-757
PATUXENT NAVAL AIR TEST C - VERIZON MARYLAND, INC.

Exchange 301-758
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-759
Cumberland - VERIZON MARYLAND, INC.

Exchange 301-760
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-761
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-762
Rockville - VERIZON MARYLAND, INC.

Exchange 301-763
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-764
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-765
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-766
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-767
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-768
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-769
MILESTOWN - VERIZON MARYLAND, INC.

Exchange 301-770
Rockville - VERIZON MARYLAND, INC.

Exchange 301-771
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-772
Landover - VERIZON MARYLAND, INC.

Exchange 301-773
Landover - VERIZON MARYLAND, INC.

Exchange 301-774
Olney - VERIZON MARYLAND, INC.

Exchange 301-775
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-776
Laurel - VERIZON MARYLAND, INC.

Exchange 301-777
Cumberland - VERIZON MARYLAND, INC.

Exchange 301-778
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-779
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-780
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-781
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-782
BRANDYWINE - VERIZON MARYLAND, INC.

Exchange 301-783
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-784
Cumberland - VERIZON MARYLAND, INC.

Exchange 301-785
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-786
KEYSER - VERIZON MARYLAND, INC.

Exchange 301-787
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-788
FREDERICK - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-789
Damascus - CORE COMMUNICATIONS, INC. - PA

Exchange 301-790
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-791
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-792
Beltsville - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 301-793
Beltsville - OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC

Exchange 301-794
Lanham - VERIZON MARYLAND, INC.

Exchange 301-795
Washington - MCIMETRO, ATS, INC.

Exchange 301-796
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-797
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-798
NEW MARKET - VERIZON MARYLAND, INC.

Exchange 301-799
MOUNT AIRY - CORE COMMUNICATIONS, INC. - MD

Exchange 301-801
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-802
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-803
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-804
Washington - MCIMETRO, ATS, INC.

Exchange 301-805
Bowie - VERIZON MARYLAND, INC.

Exchange 301-806
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-807
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-808
CAPITOL HEIGHTS - VERIZON MARYLAND, INC.

Exchange 301-809
Bowie - VERIZON MARYLAND, INC.

Exchange 301-810
Monrovia - AT&T LOCAL

Exchange 301-811
-

Exchange 301-812
NORTH BEACH - VERIZON MARYLAND, INC.

Exchange 301-813
Laurel - BALTIMORE-WASHINGTON TELEPHONE BWT

Exchange 301-814
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-815
Frederick - VERIZON MARYLAND, INC.

Exchange 301-816
Rockville - VERIZON MARYLAND, INC.

Exchange 301-817
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-818
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-819
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-820
Washington - AT&T LOCAL

Exchange 301-821
Washington - AT&T LOCAL

Exchange 301-822
Washington - AT&T LOCAL

Exchange 301-823
Washington - AT&T LOCAL

Exchange 301-824
SMITHSBURG - VERIZON MARYLAND, INC.

Exchange 301-825
Washington - AT&T LOCAL

Exchange 301-826
LEXINGTON PARK - VERIZON MARYLAND, INC.

Exchange 301-827
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-828
Washington - AT&T LOCAL

Exchange 301-829
MOUNT AIRY - VERIZON MARYLAND, INC.

Exchange 301-830
Washington - AT&T LOCAL

Exchange 301-831
BUCKEYSTOWN - VERIZON MARYLAND, INC.

Exchange 301-832
Washington - AT&T LOCAL

Exchange 301-833
Washington - AT&T - LOCAL - TN

Exchange 301-834
Brunswick - VERIZON MARYLAND, INC.

Exchange 301-835
Hagerstown - VERIZON MARYLAND, INC.

Exchange 301-836
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-837
Washington - MCIMETRO, ATS, INC.

Exchange 301-838
Rockville - VERIZON MARYLAND, INC.

Exchange 301-839
OXON HILL - VERIZON MARYLAND, INC.

Exchange 301-840
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-841
Washington - MCIMETRO, ATS, INC.

Exchange 301-842
CLEAR SPRING - VERIZON MARYLAND, INC.

Exchange 301-843
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-844
Washington - VERIZON MARYLAND, INC.

Exchange 301-845
WALKERSVILLE - VERIZON MARYLAND, INC.

Exchange 301-846
Frederick - VERIZON MARYLAND, INC.

Exchange 301-847
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-848
Washington - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-849
Hagerstown - NEW FRONTIERS TELECOMMUNICATIONS, INC.

Exchange 301-850
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-851
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-852
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-853
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-854
Clarksville - VERIZON MARYLAND, INC.

Exchange 301-855
NORTH BEACH - VERIZON MARYLAND, INC.

Exchange 301-856
Clinton - VERIZON MARYLAND, INC.

Exchange 301-857
MOUNT AIRY - CORE COMMUNICATIONS, INC. - MD

Exchange 301-858
SAINT MARGARETS - VERIZON MARYLAND, INC.

Exchange 301-859
Frederick - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-860
Bowie - VERIZON MARYLAND, INC.

Exchange 301-861
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-862
LEXINGTON PARK - VERIZON MARYLAND, INC.

Exchange 301-863
LEXINGTON PARK - VERIZON MARYLAND, INC.

Exchange 301-864
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-865
NEW MARKET - VERIZON MARYLAND, INC.

Exchange 301-866
LEXINGTON PARK - VERIZON MARYLAND, INC.

Exchange 301-867
Washington - MCIMETRO, ATS, INC.

Exchange 301-868
Clinton - VERIZON MARYLAND, INC.

Exchange 301-869
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-870
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-871
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-872
RIDGE - VERIZON MARYLAND, INC.

Exchange 301-873
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-874
BUCKEYSTOWN - VERIZON MARYLAND, INC.

Exchange 301-875
Laurel - NATIONSLINE, INC.-MD

Exchange 301-876
Frederick - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-877
Clinton - VERIZON MARYLAND, INC.

Exchange 301-878
Baltimore - VERIZON MARYLAND, INC.

Exchange 301-879
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-880
RESTON - LEVEL 3 COMMUNICATIONS, LLC - MD

Exchange 301-881
Rockville - VERIZON MARYLAND, INC.

Exchange 301-882
MOUNT AIRY - CORE COMMUNICATIONS, INC. - MD

Exchange 301-883
Landover - VERIZON MARYLAND, INC.

Exchange 301-884
MECHANICSVILLE - VERIZON MARYLAND, INC.

Exchange 301-885
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-886
Laurel - VERIZON MARYLAND, INC.

Exchange 301-887
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-888
BADEN - VERIZON MARYLAND, INC.

Exchange 301-889
GALESVILLE - VERIZON MARYLAND, INC.

Exchange 301-890
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-891
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-892
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-893
WALDORF - VERIZON MARYLAND, INC.

Exchange 301-894
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-895
GRANTSVILLE - VERIZON MARYLAND, INC.

Exchange 301-896
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-897
BETHESDA - VERIZON MARYLAND, INC.

Exchange 301-898
WALKERSVILLE - VERIZON MARYLAND, INC.

Exchange 301-899
TEMPLE HILLS - VERIZON MARYLAND, INC.

Exchange 301-900
-

Exchange 301-901
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-902
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-903
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-904
Washington - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-905
SILVER SPRING - VERIZON MARYLAND, INC.

Exchange 301-906
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-907
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-908
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-909
Washington - MCIMETRO, ATS, INC.

Exchange 301-910
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-911
-

Exchange 301-912
ODENTON - VERIZON MARYLAND, INC.

Exchange 301-913
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-914
Savage - ARCH WIRELESS HOLDINGS, INC.

Exchange 301-915
Lanham - STARPOWER COMMUNICATIONS, LLC - MD

Exchange 301-916
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-917
Lanham - STARPOWER COMMUNICATIONS, LLC - MD

Exchange 301-918
Lanham - VERIZON MARYLAND, INC.

Exchange 301-919
Greenbelt - SOUTHWESTERN BELL MOBILE SYSTEMS, LLC - DC

Exchange 301-920
Lanham - STARPOWER COMMUNICATIONS, LLC - MD

Exchange 301-921
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-922
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-923
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-924
Olney - VERIZON MARYLAND, INC.

Exchange 301-925
Landover - VERIZON MARYLAND, INC.

Exchange 301-926
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-927
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-928
Adelphi - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-929
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-930
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-931
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-932
LA PLATA - VERIZON MARYLAND, INC.

Exchange 301-933
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-934
LA PLATA - VERIZON MARYLAND, INC.

Exchange 301-935
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-936
Washington - VERIZON MARYLAND, INC.

Exchange 301-937
Beltsville - VERIZON MARYLAND, INC.

Exchange 301-938
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-939
Laurel - VERIZON MARYLAND, INC.

Exchange 301-940
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-941
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-942
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-943
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-944
Washington - MCIMETRO, ATS, INC.

Exchange 301-945
Washington - MCIMETRO, ATS, INC.

Exchange 301-946
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-947
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-948
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-949
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-950
-

Exchange 301-951
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-952
UPPER MARLBORO - VERIZON MARYLAND, INC.

Exchange 301-953
Laurel - VERIZON MARYLAND, INC.

Exchange 301-954
Baltimore - VERIZON MARYLAND, INC.

Exchange 301-955
Washington - MCIMETRO, ATS, INC.

Exchange 301-956
- VERIZON MARYLAND, INC.

Exchange 301-957
Washington - MCIMETRO, ATS, INC.

Exchange 301-958
-

Exchange 301-959
-

Exchange 301-960
Washington - MCIMETRO, ATS, INC.

Exchange 301-961
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-962
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-963
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-964
Frederick - DOBSON CELLULAR SYSTEMS, INC.

Exchange 301-965
Washington - MCIMETRO, ATS, INC.

Exchange 301-966
Washington - MCIMETRO, ATS, INC.

Exchange 301-967
SUITLAND - VERIZON MARYLAND, INC.

Exchange 301-968
- MCI WORLDCOM COMMUNICATIONS, INC. - MD

Exchange 301-969
-

Exchange 301-970
Annapolis - VERIZON MARYLAND, INC.

Exchange 301-971
Lanham - STARPOWER COMMUNICATIONS, LLC - MD

Exchange 301-972
GERMANTOWN - VERIZON MARYLAND, INC.

Exchange 301-973
Columbia - VERIZON MARYLAND, INC.

Exchange 301-974
Lanham - STARPOWER COMMUNICATIONS, LLC - MD

Exchange 301-975
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-976
Laurel -

Exchange 301-977
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-978
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-979
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-980
Annapolis Junction - CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD

Exchange 301-981
WASHINGTON - FOCAL COMMUNICATIONS CORP OF THE MID-ATLANTIC

Exchange 301-982
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-983
Bethesda - VERIZON MARYLAND, INC.

Exchange 301-984
Rockville - VERIZON MARYLAND, INC.

Exchange 301-985
Hyattsville - VERIZON MARYLAND, INC.

Exchange 301-986
Chevy Chase - VERIZON MARYLAND, INC.

Exchange 301-987
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-988
Frederick - USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD

Exchange 301-989
Silver Spring - VERIZON MARYLAND, INC.

Exchange 301-990
Gaithersburg - VERIZON MARYLAND, INC.

Exchange 301-991
Hagerstown - SPRINT SPECTRUM L.P. - MD

Exchange 301-992
Hagerstown - SPRINT SPECTRUM L.P. - MD

Exchange 301-993
COLLEGE PARK - VERIZON MARYLAND, INC.

Exchange 301-994
VALLEY LEE - VERIZON MARYLAND, INC.

Exchange 301-995
PATUXENT NAVAL AIR TEST C - VERIZON MARYLAND, INC.

Exchange 301-996
Beltsville - SPRINT SPECTRUM L.P.

Exchange 301-997
LEONARDTOWN - VERIZON MARYLAND, INC.

Exchange 301-998
Rockville - VERIZON MARYLAND, INC.

Exchange 301-999
Hagerstown - VERIZON MARYLAND, INC.