Information for Area Code: 510-xxx-xxxx - CA - CALIFORNIA

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Information about Area Code 510

Map of California area codes in blue (and border states) with 510 in red
Map of California area codes in blue (and border states) with 510 in red

North American area code 510 is a Californian telephone area code which covers most eastern Bay Area cities in Alameda County (except Dublin, Livermore, Pleasanton, and Sunol) and parts of Contra Costa County.

Cities in the 510 area code

See also


State of California Area Codes: 209, 213, 310, 323, 408, 415, 424, 510, 530, 559, 562, 619, 626, 650, 657 (upcoming), 661, 707, 714, 760, 805, 818, 831, 858, 909, 916, 925, 949, 951
North: 707
West: 415 area code 510 East: 925
South: 408

Exchanges for Area Code 510-xxx-xxxx:

Exchange 510-202
Oakland - AIRTOUCH PAGING - CALIFORNIA

Exchange 510-204
Berkeley - PACIFIC BELL

Exchange 510-205
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-206
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-207
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-208
Oakland - PACIFIC BELL

Exchange 510-209
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-211
-

Exchange 510-212
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-213
Concord - T-MOBILE USA, INC.

Exchange 510-214
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-215
Richmond - PACIFIC BELL

Exchange 510-216
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-217
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-218
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-219
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-220
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-221
Oakland -

Exchange 510-222
El Sobrante - PACIFIC BELL

Exchange 510-223
El Sobrante - PACIFIC BELL

Exchange 510-224
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-225
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-226
Fremont - PACIFIC BELL

Exchange 510-227
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-228
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-229
Berkeley - PACIFIC BELL

Exchange 510-230
Concord -

Exchange 510-231
Richmond - PACIFIC BELL

Exchange 510-232
Richmond - PACIFIC BELL

Exchange 510-233
Richmond - PACIFIC BELL

Exchange 510-234
Richmond - PACIFIC BELL

Exchange 510-235
Richmond - PACIFIC BELL

Exchange 510-236
Richmond - PACIFIC BELL

Exchange 510-237
Richmond - PACIFIC BELL

Exchange 510-238
Oakland - PACIFIC BELL

Exchange 510-239
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-240
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-241
Oakland - NETWORK SERVICES LLC

Exchange 510-242
Richmond - PACIFIC BELL

Exchange 510-243
El Sobrante - PACIFIC BELL

Exchange 510-245
Hercules - PACIFIC BELL

Exchange 510-247
Hayward - PACIFIC BELL

Exchange 510-248
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-249
Fremont - PACIFIC BELL

Exchange 510-250
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-251
Oakland - PACIFIC BELL

Exchange 510-252
Fremont - PACIFIC BELL

Exchange 510-253
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-256
San Jose - 01 COMMUNICATIONS, INC. - CA

Exchange 510-257
San Jose - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-258
San Leandro - PACIFIC BELL

Exchange 510-259
Hayward - PACIFIC BELL

Exchange 510-260
Oakland - COMCAST PHONE OF CALIFORNIA, LLC - CA

Exchange 510-261
Oakland - PACIFIC BELL

Exchange 510-262
El Sobrante - PACIFIC BELL

Exchange 510-263
Alameda - PACIFIC BELL

Exchange 510-264
Hayward - PACIFIC BELL

Exchange 510-265
Hayward - PACIFIC BELL

Exchange 510-266
Hayward - PACIFIC BELL

Exchange 510-267
Oakland - PACIFIC BELL

Exchange 510-268
Oakland - PACIFIC BELL

Exchange 510-269
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-270
- BROOKS FIBER COMMUNICATIONS - CALIFORNIA

Exchange 510-271
Oakland - PACIFIC BELL

Exchange 510-272
Oakland - PACIFIC BELL

Exchange 510-273
Oakland - PACIFIC BELL

Exchange 510-274
San Francisco - CommPartners, LLC - CA

Exchange 510-275
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-276
San Leandro - PACIFIC BELL

Exchange 510-277
Oakland - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-278
San Leandro - PACIFIC BELL

Exchange 510-279
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-280
Fremont - XO CALIFORNIA, INC.

Exchange 510-281
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-282
Concord - T-MOBILE USA, INC.

Exchange 510-283
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-284
Fremont - PACIFIC BELL

Exchange 510-285
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-286
Oakland - PACIFIC BELL

Exchange 510-287
Oakland - PACIFIC BELL

Exchange 510-288
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-289
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-290
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-291
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-292
Berkeley - PACIFIC BELL

Exchange 510-293
Hayward - PACIFIC BELL

Exchange 510-295
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-296
San Francisco - LEVEL 3 COMMUNICATIONS, LLC - CA

Exchange 510-297
San Leandro - PACIFIC BELL

Exchange 510-299
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-300
San Jose - U.S. TELEPACIFIC CORP. - CA

Exchange 510-301
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-302
Oakland - PACIFIC BELL

Exchange 510-303
Santa Clara - PACIFIC BELL MOBILE SERVICES

Exchange 510-304
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-305
Santa Clara - PACIFIC BELL MOBILE SERVICES

Exchange 510-306
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-307
Richmond - PACIFIC BELL

Exchange 510-308
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-309
Fremont - ARCH WIRELESS HOLDINGS, INC.

Exchange 510-310
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-311
-

Exchange 510-312
Oakland - COOK TELECOM, INC.

Exchange 510-313
- TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-314
Oakland -

Exchange 510-315
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-316
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-317
San Leandro - PACIFIC BELL

Exchange 510-318
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-319
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-321
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-322
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-323
Fremont - XO CALIFORNIA, INC.

Exchange 510-324
Union City - PACIFIC BELL

Exchange 510-325
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-326
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-327
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-329
Santa Clara - PACIFIC BELL MOBILE SERVICES

Exchange 510-330
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-331
Santa Clara - PACIFIC BELL MOBILE SERVICES

Exchange 510-332
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-333
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-334
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-336
Oakland - PACIFIC BELL

Exchange 510-337
Alameda - PACIFIC BELL

Exchange 510-338
Oakland - PACIFIC BELL

Exchange 510-339
Oakland - PACIFIC BELL

Exchange 510-341
-

Exchange 510-342
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-343
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-344
PORTLAND - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-345
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-346
San Leandro - PACIFIC BELL

Exchange 510-347
San Leandro - PACIFIC BELL

Exchange 510-348
- DIGITCOM SERVICES, INC.

Exchange 510-349
Oakland - COOK TELECOM, INC.

Exchange 510-350
Oakland - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-351
San Leandro - PACIFIC BELL

Exchange 510-352
San Leandro - PACIFIC BELL

Exchange 510-353
Fremont - PACIFIC BELL

Exchange 510-354
Fremont - PACIFIC BELL

Exchange 510-355
Oakland - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-357
San Leandro - PACIFIC BELL

Exchange 510-360
Fremont - PACIFIC BELL

Exchange 510-361
El Sobrante - ARCH WIRELESS HOLDINGS, INC.

Exchange 510-364
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-366
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-367
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-368
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-372
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-373
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-374
Richmond - PACIFIC BELL

Exchange 510-375
Concord - T-MOBILE USA, INC.

Exchange 510-376
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-377
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-378
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-379
- TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-380
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-381
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-382
Oakland - PACIFIC BELL

Exchange 510-383
Oakland - PACIFIC BELL

Exchange 510-384
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-385
- NEXTEL COMMUNICATIONS

Exchange 510-386
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-387
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-388
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-389
Oakland - SAN DIEGO PAGING

Exchange 510-390
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-391
Oakland - SAN DIEGO PAGING

Exchange 510-392
Oakland - SAN DIEGO PAGING

Exchange 510-393
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-394
Oakland - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-395
Oakland - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-396
Concord - T-MOBILE USA, INC.

Exchange 510-400
Fremont - XO CALIFORNIA, INC.

Exchange 510-401
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-402
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-403
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-404
- MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-405
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-406
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-407
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-409
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-410
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-411
-

Exchange 510-412
Richmond - PACIFIC BELL

Exchange 510-413
Fremont - PACIFIC BELL

Exchange 510-414
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-415
Concord - T-MOBILE USA, INC.

Exchange 510-416
San Francisco - NORTH COUNTY COMMUNICATIONS CORP. - CA

Exchange 510-417
Concord - T-MOBILE USA, INC.

Exchange 510-418
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-419
Oakland - PACIFIC BELL

Exchange 510-420
Oakland - PACIFIC BELL

Exchange 510-421
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-422
Oakland - NETWORK SERVICES LLC

Exchange 510-425
Oakland - PACIFIC BELL

Exchange 510-427
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-428
Oakland - PACIFIC BELL

Exchange 510-429
Union City - PACIFIC BELL

Exchange 510-430
Oakland - PACIFIC BELL

Exchange 510-431
PORTLAND - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-432
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-433
Oakland - PACIFIC BELL

Exchange 510-434
Oakland - PACIFIC BELL

Exchange 510-435
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-436
Oakland - PACIFIC BELL

Exchange 510-437
Oakland - PACIFIC BELL

Exchange 510-438
Fremont - PACIFIC BELL

Exchange 510-439
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-440
Fremont - PACIFIC BELL

Exchange 510-441
Union City - PACIFIC BELL

Exchange 510-442
Oakland - AIRTOUCH PAGING - CALIFORNIA

Exchange 510-444
Oakland - PACIFIC BELL

Exchange 510-445
Fremont - PACIFIC BELL

Exchange 510-446
Oakland - PACIFIC BELL

Exchange 510-448
Oakland - AIRTOUCH PAGING - CALIFORNIA

Exchange 510-449
Oakland - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-450
Oakland - PACIFIC BELL

Exchange 510-451
Oakland - PACIFIC BELL

Exchange 510-452
Oakland - PACIFIC BELL

Exchange 510-453
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-455
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-456
San Jose - U.S. TELEPACIFIC CORP. - CA

Exchange 510-457
Oakland - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-459
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-461
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-463
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-464
Oakland - PACIFIC BELL

Exchange 510-465
Oakland - PACIFIC BELL

Exchange 510-466
Oakland - PACIFIC BELL

Exchange 510-467
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-468
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-469
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-471
Union City - PACIFIC BELL

Exchange 510-472
OAKLAND - METRO PCS, INC.

Exchange 510-473
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-474
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-475
Union City - PACIFIC BELL

Exchange 510-476
Union City - PACIFIC BELL

Exchange 510-477
Union City - PACIFIC BELL

Exchange 510-478
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-479
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-481
San Leandro - PACIFIC BELL

Exchange 510-482
Oakland - PACIFIC BELL

Exchange 510-483
San Leandro - PACIFIC BELL

Exchange 510-484
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-485
OAKLAND - WINSTAR COMMUNICATIONS, LLC - CA

Exchange 510-486
Berkeley - PACIFIC BELL

Exchange 510-487
Union City - PACIFIC BELL

Exchange 510-488
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-489
Union City - PACIFIC BELL

Exchange 510-490
Fremont - PACIFIC BELL

Exchange 510-491
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-492
Fremont - PACIFIC BELL

Exchange 510-493
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-494
Fremont - PACIFIC BELL

Exchange 510-495
Berkeley - PACIFIC BELL

Exchange 510-496
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-497
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-498
Fremont - PACIFIC BELL

Exchange 510-499
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-500
Fremont - XO CALIFORNIA, INC.

Exchange 510-501
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-502
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-503
Oakland - AIRTOUCH PAGING - CALIFORNIA

Exchange 510-504
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-505
Fremont - PACIFIC BELL

Exchange 510-506
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-507
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-508
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-511
-

Exchange 510-512
Concord - T-MOBILE USA, INC.

Exchange 510-515
Oakland - METROCALL

Exchange 510-517
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-520
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-521
Alameda - PACIFIC BELL

Exchange 510-522
Alameda - PACIFIC BELL

Exchange 510-523
Alameda - PACIFIC BELL

Exchange 510-524
Berkeley - PACIFIC BELL

Exchange 510-525
Berkeley - PACIFIC BELL

Exchange 510-526
Berkeley - PACIFIC BELL

Exchange 510-527
Berkeley - PACIFIC BELL

Exchange 510-528
Berkeley - PACIFIC BELL

Exchange 510-529
Richmond - PACIFIC BELL

Exchange 510-530
Oakland - PACIFIC BELL

Exchange 510-531
Oakland - PACIFIC BELL

Exchange 510-532
Oakland - PACIFIC BELL

Exchange 510-533
Oakland - PACIFIC BELL

Exchange 510-534
Oakland - PACIFIC BELL

Exchange 510-535
Oakland - PACIFIC BELL

Exchange 510-536
Oakland - PACIFIC BELL

Exchange 510-537
Hayward - PACIFIC BELL

Exchange 510-538
Hayward - PACIFIC BELL

Exchange 510-539
Oakland - AIRTOUCH PAGING - CALIFORNIA

Exchange 510-540
Berkeley - PACIFIC BELL

Exchange 510-541
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-542
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-543
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-544
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-545
Fremont - XO CALIFORNIA, INC.

Exchange 510-546
Oakland - NETWORK SERVICES LLC

Exchange 510-547
Oakland - PACIFIC BELL

Exchange 510-548
Berkeley - PACIFIC BELL

Exchange 510-549
Berkeley - PACIFIC BELL

Exchange 510-550
Oakland - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-551
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-552
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-553
Oakland - PACIFIC BELL

Exchange 510-554
- SILVER STRAND ENTERPRISES, LLC

Exchange 510-555
Oakland - PACIFIC BELL

Exchange 510-557
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-558
Berkeley - PACIFIC BELL

Exchange 510-559
Berkeley - PACIFIC BELL

Exchange 510-561
Oakland - METROCALL

Exchange 510-562
Oakland - PACIFIC BELL

Exchange 510-563
Oakland - PACIFIC BELL

Exchange 510-564
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-565
Concord - T-MOBILE USA, INC.

Exchange 510-566
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-567
Oakland - PACIFIC BELL

Exchange 510-568
Oakland - PACIFIC BELL

Exchange 510-569
Oakland - PACIFIC BELL

Exchange 510-571
Oakland - NETWORK SERVICES LLC

Exchange 510-572
Fremont - PACIFIC BELL

Exchange 510-573
Oakland - COMCAST PHONE OF CALIFORNIA, LLC - CA

Exchange 510-574
Fremont - PACIFIC BELL

Exchange 510-575
OAKLAND - WINSTAR COMMUNICATIONS, LLC - CA

Exchange 510-576
Fremont - XO CALIFORNIA, INC.

Exchange 510-577
Oakland - PACIFIC BELL

Exchange 510-578
Fremont - XO CALIFORNIA, INC.

Exchange 510-579
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-580
Fremont - XO CALIFORNIA, INC.

Exchange 510-581
Hayward - PACIFIC BELL

Exchange 510-582
Hayward - PACIFIC BELL

Exchange 510-583
Hayward - PACIFIC BELL

Exchange 510-584
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-585
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-586
Oakland - COMCAST PHONE OF CALIFORNIA, LLC - CA

Exchange 510-587
Oakland - PACIFIC BELL

Exchange 510-588
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-589
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-590
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-591
Oakland - NETWORK SERVICES LLC

Exchange 510-592
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-593
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-594
Oakland - PACIFIC BELL

Exchange 510-595
Oakland - PACIFIC BELL

Exchange 510-596
Oakland - PACIFIC BELL

Exchange 510-597
Oakland - PACIFIC BELL

Exchange 510-599
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-601
Oakland - PACIFIC BELL

Exchange 510-604
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-607
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-608
Fremont - PACIFIC BELL

Exchange 510-610
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-611
-

Exchange 510-612
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-613
Oakland - PACIFIC BELL

Exchange 510-614
San Leandro - PACIFIC BELL

Exchange 510-615
Oakland - PACIFIC BELL

Exchange 510-618
San Leandro - PACIFIC BELL

Exchange 510-619
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-620
Richmond - PACIFIC BELL

Exchange 510-621
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-622
Oakland - PACIFIC BELL

Exchange 510-623
Fremont - PACIFIC BELL

Exchange 510-624
Fremont - PACIFIC BELL

Exchange 510-625
Oakland - PACIFIC BELL

Exchange 510-627
Oakland - PACIFIC BELL

Exchange 510-628
Oakland - PACIFIC BELL

Exchange 510-629
San Francisco - WINSTAR COMMUNICATIONS, LLC - CA

Exchange 510-630
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-632
Oakland - PACIFIC BELL

Exchange 510-633
Oakland - PACIFIC BELL

Exchange 510-635
Oakland - PACIFIC BELL

Exchange 510-636
Oakland - PACIFIC BELL

Exchange 510-637
Oakland - PACIFIC BELL

Exchange 510-638
Oakland - PACIFIC BELL

Exchange 510-639
Oakland - PACIFIC BELL

Exchange 510-641
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-642
Berkeley - PACIFIC BELL

Exchange 510-643
Berkeley - PACIFIC BELL

Exchange 510-644
Berkeley - PACIFIC BELL

Exchange 510-645
Oakland - PACIFIC BELL

Exchange 510-647
Berkeley - PACIFIC BELL

Exchange 510-648
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-649
Berkeley - PACIFIC BELL

Exchange 510-651
Fremont - PACIFIC BELL

Exchange 510-652
Oakland - PACIFIC BELL

Exchange 510-653
Oakland - PACIFIC BELL

Exchange 510-654
Oakland - PACIFIC BELL

Exchange 510-655
Oakland - PACIFIC BELL

Exchange 510-656
Fremont - PACIFIC BELL

Exchange 510-657
Fremont - PACIFIC BELL

Exchange 510-658
Oakland - PACIFIC BELL

Exchange 510-659
Fremont - PACIFIC BELL

Exchange 510-661
Fremont - PACIFIC BELL

Exchange 510-662
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-663
Oakland - PACIFIC BELL

Exchange 510-664
Berkeley - PACIFIC BELL

Exchange 510-665
Berkeley - PACIFIC BELL

Exchange 510-666
Berkeley - PACIFIC BELL

Exchange 510-667
San Leandro - PACIFIC BELL

Exchange 510-668
Fremont - PACIFIC BELL

Exchange 510-669
El Sobrante - PACIFIC BELL

Exchange 510-670
Hayward - PACIFIC BELL

Exchange 510-672
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-673
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-675
Union City - PACIFIC BELL

Exchange 510-676
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-677
OAKLAND - METRO PCS, INC.

Exchange 510-678
San Leandro - PACIFIC BELL

Exchange 510-681
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-682
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-683
Fremont - PACIFIC BELL

Exchange 510-684
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-685
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-686
San Francisco - SBC IP COMMUNICATIONS, INC.

Exchange 510-687
Fremont - PACIFIC BELL

Exchange 510-688
Concord - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-689
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-690
- PACIFIC BELL

Exchange 510-691
Santa Rosa - SPRINT SPECTRUM L.P.

Exchange 510-692
OAKLAND - WINSTAR COMMUNICATIONS, LLC - CA

Exchange 510-693
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-696
San Leandro - ARCH WIRELESS HOLDINGS, INC.

Exchange 510-697
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-698
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-699
- DIGITCOM SERVICES, INC.

Exchange 510-700
-

Exchange 510-701
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-702
Oakland - METROCALL

Exchange 510-703
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-704
Berkeley - PACIFIC BELL

Exchange 510-705
Berkeley - PACIFIC BELL

Exchange 510-706
OAKLAND - METRO PCS, INC.

Exchange 510-708
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-709
San Jose - 01 COMMUNICATIONS, INC. - CA

Exchange 510-710
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-711
-

Exchange 510-712
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-713
Fremont - PACIFIC BELL

Exchange 510-714
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-715
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-716
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-717
Concord - T-MOBILE USA, INC.

Exchange 510-718
Oakland - COOK TELECOM, INC.

Exchange 510-719
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-720
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-721
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-722
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-723
Hayward - PACIFIC BELL

Exchange 510-724
Hercules - PACIFIC BELL

Exchange 510-725
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-726
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-727
Hayward - PACIFIC BELL

Exchange 510-728
Hayward - PACIFIC BELL

Exchange 510-729
Oakland - PACIFIC BELL

Exchange 510-731
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-732
Hayward - PACIFIC BELL

Exchange 510-733
Hayward - PACIFIC BELL

Exchange 510-734
Concord - PACIFIC BELL MOBILE SERVICES

Exchange 510-735
Oakland - PACIFIC BELL

Exchange 510-739
Fremont - PACIFIC BELL

Exchange 510-740
Fremont - XO CALIFORNIA, INC.

Exchange 510-741
Hercules - PACIFIC BELL

Exchange 510-742
Fremont - PACIFIC BELL

Exchange 510-743
Fremont - XO CALIFORNIA, INC.

Exchange 510-744
Fremont - PACIFIC BELL

Exchange 510-745
Fremont - PACIFIC BELL

Exchange 510-746
San Jose - U.S. TELEPACIFIC CORP. - CA

Exchange 510-747
Alameda - PACIFIC BELL

Exchange 510-748
Alameda - PACIFIC BELL

Exchange 510-749
Alameda - PACIFIC BELL

Exchange 510-750
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-751
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-752
Oakland - PACIFIC BELL

Exchange 510-754
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-755
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-757
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-758
El Sobrante - PACIFIC BELL

Exchange 510-759
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-760
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-761
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-762
Oakland - PACIFIC BELL

Exchange 510-763
Oakland - PACIFIC BELL

Exchange 510-764
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-765
El Sobrante - PACIFIC BELL

Exchange 510-767
Oakland - PACIFIC BELL

Exchange 510-768
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-769
Alameda - PACIFIC BELL

Exchange 510-770
Fremont - PACIFIC BELL

Exchange 510-771
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-772
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-773
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-774
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-776
OAKLAND - METRO PCS, INC.

Exchange 510-777
Oakland - PACIFIC BELL

Exchange 510-778
Oakland -

Exchange 510-779
- FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-780
Hayward - PACIFIC BELL

Exchange 510-781
Hayward - PACIFIC BELL

Exchange 510-782
Hayward - PACIFIC BELL

Exchange 510-783
Hayward - PACIFIC BELL

Exchange 510-784
Hayward - PACIFIC BELL

Exchange 510-785
Hayward - PACIFIC BELL

Exchange 510-786
Hayward - PACIFIC BELL

Exchange 510-787
Crockett - PACIFIC BELL

Exchange 510-788
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-789
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-790
Fremont - PACIFIC BELL

Exchange 510-791
Fremont - PACIFIC BELL

Exchange 510-792
Fremont - PACIFIC BELL

Exchange 510-793
Fremont - PACIFIC BELL

Exchange 510-794
Fremont - PACIFIC BELL

Exchange 510-795
Fremont - PACIFIC BELL

Exchange 510-796
Fremont - PACIFIC BELL

Exchange 510-797
Fremont - PACIFIC BELL

Exchange 510-798
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-799
Hercules - PACIFIC BELL

Exchange 510-801
Oakland - METROCALL

Exchange 510-802
Oakland - METROCALL

Exchange 510-803
Fremont - XO CALIFORNIA, INC.

Exchange 510-804
Oakland - NETWORK SERVICES LLC

Exchange 510-805
Oakland - METROCALL

Exchange 510-807
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-808
Oakland - PACIFIC BELL

Exchange 510-809
San Jose - U.S. TELEPACIFIC CORP. - CA

Exchange 510-810
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-811
-

Exchange 510-812
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-813
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-814
Alameda - PACIFIC BELL

Exchange 510-815
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-816
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-817
Oakland - PACIFIC BELL

Exchange 510-818
Oakland - PACIFIC BELL

Exchange 510-819
Oakland - NETWORK SERVICES LLC

Exchange 510-821
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-823
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-824
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-825
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-827
OAKLAND - METRO PCS, INC.

Exchange 510-828
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-830
San Jose - 01 COMMUNICATIONS, INC. - CA

Exchange 510-832
Oakland - PACIFIC BELL

Exchange 510-834
Oakland - PACIFIC BELL

Exchange 510-835
Oakland - PACIFIC BELL

Exchange 510-836
Oakland - PACIFIC BELL

Exchange 510-837
Oakland - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-839
Oakland - PACIFIC BELL

Exchange 510-840
Oakland - AIRTOUCH PAGING - CALIFORNIA

Exchange 510-841
Berkeley - PACIFIC BELL

Exchange 510-842
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-843
Berkeley - PACIFIC BELL

Exchange 510-844
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-845
Berkeley - PACIFIC BELL

Exchange 510-846
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-847
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-848
Berkeley - PACIFIC BELL

Exchange 510-849
Berkeley - PACIFIC BELL

Exchange 510-851
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-852
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-853
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-854
San Jose - 01 COMMUNICATIONS, INC. - CA

Exchange 510-855
San Francisco - THE TELEPHONE CONNECTION OF LOS ANGELES, INC.

Exchange 510-856
- ALLEGIANCE TELECOM, INC. - CA

Exchange 510-857
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-858
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-859
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-860
- LEVEL 3 COMMUNICATIONS, LLC - CA

Exchange 510-861
Santa Clara - PACIFIC BELL MOBILE SERVICES

Exchange 510-862
Santa Clara - PACIFIC BELL MOBILE SERVICES

Exchange 510-863
San Francisco - MCIMETRO, ATS, INC.

Exchange 510-864
Alameda - PACIFIC BELL

Exchange 510-865
Alameda - PACIFIC BELL

Exchange 510-866
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-867
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-868
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-869
Oakland - PACIFIC BELL

Exchange 510-870
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-872
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-873
Oakland - PACIFIC BELL

Exchange 510-874
Oakland - PACIFIC BELL

Exchange 510-875
Fremont - XO CALIFORNIA, INC.

Exchange 510-877
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-878
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-879
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-880
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-881
Hayward - PACIFIC BELL

Exchange 510-882
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-883
Berkeley - PACIFIC BELL

Exchange 510-884
Hayward - PACIFIC BELL

Exchange 510-885
Hayward - PACIFIC BELL

Exchange 510-886
Hayward - PACIFIC BELL

Exchange 510-887
Hayward - PACIFIC BELL

Exchange 510-888
Hayward - PACIFIC BELL

Exchange 510-889
Hayward - PACIFIC BELL

Exchange 510-891
Oakland - PACIFIC BELL

Exchange 510-892
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-893
Oakland - PACIFIC BELL

Exchange 510-894
Oakland - COMCAST PHONE OF CALIFORNIA, LLC - CA

Exchange 510-895
San Leandro - PACIFIC BELL

Exchange 510-896
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-897
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-898
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-899
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-903
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-904
San Francisco - FOCAL COMMUNICATIONS CORP OF CALIFORNIA

Exchange 510-907
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-908
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-909
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-910
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-911
-

Exchange 510-912
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-913
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-914
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-915
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-917
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-918
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-919
- CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA

Exchange 510-920
Oakland - NETWORK SERVICES LLC

Exchange 510-921
San Francisco - TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-922
Oakland - PACIFIC BELL

Exchange 510-923
Oakland - PACIFIC BELL

Exchange 510-924
Oakland - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-926
- TELEPORT COMMUNICATIONS GROUP - SAN FRANCISCO

Exchange 510-927
Oakland - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-928
Concord - AT&T WIRELESS SERVICES, INC.

Exchange 510-929
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-931
San Jose - 01 COMMUNICATIONS, INC. - CA

Exchange 510-932
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-933
San Jose - U.S. TELEPACIFIC CORP. - CA

Exchange 510-936
Fremont - PACIFIC BELL

Exchange 510-938
OAKLAND - METRO PCS, INC.

Exchange 510-940
San Jose - MPOWER COMMUNICATIONS CORP. - CA

Exchange 510-943
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-948
Fremont - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-950
-

Exchange 510-952
Dublin - NEXTEL COMMUNICATIONS

Exchange 510-957
SAN FRANCISCO - ALLEGIANCE TELECOM, INC. - CA

Exchange 510-958
-

Exchange 510-959
-

Exchange 510-962
San Francisco - LEVEL 3 COMMUNICATIONS, LLC - CA

Exchange 510-964
Hercules - PACIFIC BELL

Exchange 510-965
Richmond - PACIFIC BELL

Exchange 510-966
Oakland - NETWORK SERVICES LLC

Exchange 510-967
Oakland - SPRINT SPECTRUM L.P.

Exchange 510-968
Oakland - COOK TELECOM, INC.

Exchange 510-969
Walnut Creek - TIME WARNER TELECOM OF CALIFORNIA, L.P.

Exchange 510-970
Richmond - PACIFIC BELL

Exchange 510-972
Oakland - COMCAST PHONE OF CALIFORNIA, LLC - CA

Exchange 510-976
-

Exchange 510-977
Oakland - NETWORK SERVICES LLC

Exchange 510-978
San Francisco - LEVEL 3 COMMUNICATIONS, LLC - CA

Exchange 510-979
Fremont - PACIFIC BELL

Exchange 510-980
- ARCH WIRELESS HOLDINGS, INC.

Exchange 510-981
Berkeley - PACIFIC BELL

Exchange 510-982
Hayward - MCI WORLDCOM COMMUNICATIONS, INC., CA

Exchange 510-984
San Francisco - WINSTAR COMMUNICATIONS, LLC - CA

Exchange 510-985
Oakland - PACIFIC BELL

Exchange 510-986
Oakland - PACIFIC BELL

Exchange 510-987
Oakland - PACIFIC BELL

Exchange 510-991
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-992
Oakland - PAC - WEST TELECOMM, INC.

Exchange 510-994
Oakland - NETWORK SERVICES LLC

Exchange 510-995
San Jose - U.S. TELEPACIFIC CORP. - CA

Exchange 510-996
PORTLAND - GLOBAL CROSSING LOCAL SERVICES, INC.-CA

Exchange 510-997
Oakland - NETWORK SERVICES LLC