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  5. Area Code 925

Where Is Area Code 925?

Area code 925 is found in the US state of California. Primarily servicing the city of Concord (population: 127291), area code 925 covers 2 counties of California.

Located in the Pacific time zone, area code 925 is on the same time as Los Angeles, CA.

Area code 925 was brought into effect on March 14, 1998. 925 was split from the parent 510 area code.

Map of  with area code 925 highlighted

Counties in Area Code 925

  • Alameda,
  • Contra Costa.

Most Populous Cities in Area Code 925

City County City Population Time Zone
Concord Contra Costa 127,291 PST
Antioch Contra Costa 105,722 PST
Pittsburg Contra Costa 87,107 PST
Livermore Alameda 86,227 PST
Walnut Creek Contra Costa 84,960 PST
San Ramon Contra Costa 75,534 PST
Pleasanton Alameda 73,836 PST
Brentwood Contra Costa 56,196 PST
Danville Contra Costa 55,114 PST
Martinez Contra Costa 48,436 PST
Dublin Alameda 47,370 PST
Oakley Contra Costa 37,579 PST
Pleasant Hill Contra Costa 34,547 PST
Lafayette Contra Costa 27,646 PST
Orinda Contra Costa 18,187 PST
Moraga Contra Costa 16,674 PST
Alamo Contra Costa 15,322 PST
Discovery Bay Contra Costa 13,793 PST
Clayton Contra Costa 12,745 PST
Bethel Island Contra Costa 2,199 PST
Byron Contra Costa 1,399 PST

Note: The above list is based off of the top 25 most populous cities in the area code as per 2012 United States Census Bureau estimates.

View all United States Area Codes.

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This page was last updated on July 3, 2015.