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Area code 925

Area code 925 Walnut, California

Area code 925 is in California, with numbers assigned in Walnut, Concord, Pleasanton and 12 more places. It’s 9:10 PM there now.

State
California41 area codes in California
Time zone
Pacific9:10 PM there now
Exchanges
64015 places
Overlay
NoneThe only code for its area
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Where area code 925 is

Numbers in 925 are assigned to 15 places in 4 counties: Contra Costa County, Alameda County, Los Angeles County and Inyo County.

No single place dominates: Walnut, the largest, has 16% of the exchanges.

  • Walnut103
  • Concord89
  • Pleasanton76
  • Antioch67
  • Livermore50
  • Bishop43
  • Dublin42
  • Danville38
  • Pittsburg29
  • Martinez22
  • Lafayette15
  • Orinda12
  • Clayton12
  • Moraga11
  • Sunol9

Phone companies in 925

640 blocks of numbers in 925 are held by 29 phone companies. The most belong to AT&T (206), T-Mobile (67) and AT&T Mobility (48).

A large share, about 42%, belongs to competitive and internet phone carriers; wireless networks hold 24% and local phone and cable companies 34%.

A block’s holder is the company it was first assigned to; numbers can move to other carriers since.

History and overlays

925 went into service in 1998, added to the area of 510.

51 new exchanges were assigned since 2021, the latest in September 2026.

Calling 925

It’s 9:10 PM Pacific time in 925 right now.

From elsewhere in the U.S., dial 1, 925 and the 7-digit number.

Nearby area codes

California has 41 area codes: 209, 213, 279, 310, 323, 341, 350, 357, 369, 408, 415, 424, 442, 510, 530, 559, 562, 619, 626, 628, 650, 657, 661, 669, 707, 714, 738, 747, 760, 805, 818, 820, 831, 837, 840, 858, 909, 916, 925, 949 and 951.

From the North American Numbering Plan Administrator’s area code and exchange records (10/22/2026) and U.S. Census place and county names. Places and companies are where number blocks were assigned, not where anyone lives or which carrier a number uses today.

Map of the 925 area code

Map of the 925 area code around Walnut, Concord and Pleasanton, California.

Interactive map © OpenStreetMap contributors

Cities on the map

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Questions about 925

Where is area code 925?

In California, covering Walnut, Concord and Pleasanton and other places across 4 counties.

What time zone is 925 in?

Pacific time. It was 9:10 PM there when this page loaded.

Is 925 an overlay?

No. 925 is the only area code for its area right now.

Which phone companies have 925 numbers?

29 companies hold blocks; the most belong to AT&T, T-Mobile and AT&T Mobility. About 24% of blocks are wireless.

Is 925 running out of numbers?

Not on record. 51 new exchanges have been assigned since 2021.