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The numbering plan area includes southeastern
Alameda County (Dublin, Pleasanton, Livermore, Sunol, and unincorporated areas surrounding those communities), and all of Contra Costa County except the western part (El Cerrito to Crockett).
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123:. Area code 925 was created March 14, 1998, when area code 510 was split along the natural border of the
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437:"Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline)"
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in 1998. The numbering plan area comprises the inland portions of the East Bay counties of
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Numbering plan areas in
California (blue) and border states. Area code 925 is shown in red.
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Prior to
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442:. North American Numbering Plan Administrator. January 8, 2021
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The numbering plan area (NPA) was originally served with
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was designated nationwide as a dialing code for the
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150:. The area code was therefore transitioned to
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474:California Public Utilities Commission
16:Area code in California, United States
7:
144:National Suicide Prevention Lifeline
465:NANPA area code map of California
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119:was created to serve most of the
701:Area codes in the United States
696:Contra Costa County, California
1:
476:, Telecommunications Division
417:List of California area codes
77:North American Numbering Plan
470:Report on the 925 area code
79:for a northern part of the
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691:Alameda County, California
264:Blackhawk-Camino Tassajara
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686:Area codes in California
87:. It was created in an
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154:on October 24, 2021.
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706:Northern California
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324:Marsh Creek Springs
222:Contra Costa County
148:seven-digit dialing
136:central office code
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205:San Ramon Village
152:ten-digit dialing
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185:East Pleasanton
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89:area code split
71:is a telephone
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459:External links
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163:Alameda County
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138:988. In 2020,
125:Berkeley Hills
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69:Area code 925
662:37.9°N 122°W
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484:area codes:
444:. Retrieved
431:
404:Walnut Creek
158:Service area
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101:Contra Costa
68:
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665: /
389:Shore Acres
680:Categories
667:37.9; -122
482:California
423:References
234:Alamo Oaks
200:Pleasanton
85:California
81:U.S. state
394:Vine Hill
379:San Ramon
369:Pittsburg
319:Lafayette
314:Knightsen
269:Brentwood
259:Blackhawk
244:Bay Point
195:Livermore
175:Dougherty
73:area code
653:122°00′W
446:March 9,
411:See also
329:Martinez
299:Danville
170:Altamont
121:East Bay
650:37°54′N
635:408/669
622:209/350
608:510/341
595:916/279
591:707/369
566:916/279
562:909/840
554:818/747
550:805/820
546:760/442
542:714/657
538:707/369
522:619/858
506:510/341
502:415/628
498:408/669
494:310/424
490:213/323
486:209/350
384:Saranap
364:Pacheco
294:Concord
284:Clayton
239:Antioch
107:History
97:Alameda
75:in the
399:Waldon
359:Orwood
354:Orinda
349:Oakley
339:Moraga
334:Mococo
304:Diablo
279:Canyon
254:Bixler
180:Dublin
631:South
587:North
440:(PDF)
289:Clyde
274:Byron
229:Alamo
215:Ulmar
210:Sunol
618:East
604:West
448:2021
99:and
613:925
578:951
574:949
570:925
558:831
534:661
530:650
526:626
518:562
514:559
510:530
140:988
91:of
83:of
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127:.
103:.
450:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.