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All Area Codes/California
925

Antioch, California

Area code 925

State
California
Region
Pacific
Time zone
PT
Type
Geographic
--:--local time

Got a missed call from 925?

Our directory lists 925 for Antioch, California, but an area code alone cannot establish who is calling. Scammers can fake caller ID to match the first six digits of the number they are dialing, a trick called neighbor spoofing, so a familiar-looking code proves nothing about who is really calling.

If you were not expecting the call, let it go to voicemail. Verify the caller through a trusted contact method before returning the call, and never share personal details with an unverified caller.

Worth knowing: an area code no longer tells you where someone is. Mobile numbers keep their original code when people move, so a 925 number may belong to someone who left California years ago.

Frequently asked questions about 925

Where is area code 925?

Our directory lists area code 925 for Antioch, California. The listed city is a reference location, not a complete coverage map. A phone number's area code does not establish the caller's current location.

What time zone is area code 925 in?

This directory uses Pacific Time (PT) for California. This is state-level guidance; confirm the recipient's local time before calling.

Is area code 925 a scam?

An area code alone cannot tell you whether a call is genuine. Caller ID can be spoofed, including numbers that appear local. Let unexpected calls go to voicemail and verify the caller independently before sharing personal information.

Is area code 925 toll-free?

The directory lists 925 as a geographic area code, not a toll-free code. US toll-free codes include 800, 833, 844, 855, 866, 877, and 888. Your carrier and calling plan determine any charges.

37 listed area codes in California

209 Lodi213 Los Angeles279 Arden-Arcade310 Los Angeles323 Los Angeles341 Oakland369 Santa Rosa408 Gilroy415 San Francisco424 Beverly Hills442 Apple Valley510 Alameda530 Chico559 Clovis562 Bellflower619 Chula Vista626 Alhambra627 Santa Rosa628 San Francisco650 Daly City657 Anaheim661 Earlimart669 San Jose707 Benicia714 Anaheim747 Burbank760 Apple Valley805 Camarillo818 Agoura Hills820 Camarillo831 Salinas858 San Diego909 Anaheim916 Elk Grove949 Costa Mesa951 Corona

Nearby in the Pacific

206 Seattle253 Kent360 Bellingham425 Bellevue458 Eugene503 Beaver509 Kennewick541 Bend564 Seattle808 Honolulu

Where Is Area Code 925?

Area code 925 serves the eastern East Bay in Northern California, mainly Contra Costa County and parts of eastern Alameda County. It includes Antioch, its primary city, and communities in the Diablo Valley and Tri-Valley. Area-code boundaries do not match county lines, and some western Contra Costa communities use a different area code.

The 925 region stretches from Antioch and Oakley near the Sacramento-San Joaquin Delta to Walnut Creek and San Ramon, then south to Dublin, Pleasanton, and Livermore. Mount Diablo State Park is a major landmark in Contra Costa County. Mount Diablo reaches 3,849 feet (1,173 meters) at its summit.

Cities and Communities in the 925 Area Code

  • Alamo, Contra Costa County
  • Antioch, Contra Costa County
  • Bay Point, Contra Costa County
  • Blackhawk, Contra Costa County
  • Brentwood, Contra Costa County
  • Clayton, Contra Costa County
  • Concord, Contra Costa County
  • Danville, Contra Costa County
  • Diablo, Contra Costa County
  • Discovery Bay, Contra Costa County
  • Dublin, Alameda County
  • Lafayette, Contra Costa County
  • Livermore, Alameda County
  • Martinez, Contra Costa County
  • Moraga, Contra Costa County
  • Oakley, Contra Costa County
  • Orinda, Contra Costa County
  • Pacheco, Contra Costa County
  • Pittsburg, Contra Costa County
  • Pleasant Hill, Contra Costa County
  • Pleasanton, Alameda County
  • San Ramon, Contra Costa County
  • Walnut Creek, Contra Costa County

History of Area Code 925

Area code 925 began service on March 14, 1998, when it split from area code 510. The split assigned many eastern East Bay communities to 925 while western communities continued to use 510. The 510 area code had itself been created from 415 in 1991.

The 925 split created a separate supply of telephone numbers for the eastern East Bay. No overlay or further split has changed 925. The 341 overlay applies to area code 510, not 925.

Key Facts About Area Code 925

  • Area code 925 is a geographic code in California, and Antioch is its primary city.
  • The 925 service area includes parts of Contra Costa County and eastern Alameda County, but not every community in either county.
  • The area code is in California, which the U.S. Census Bureau places in the Pacific region.
  • Area code 925 follows Pacific Time, with Pacific Standard Time in winter and Pacific Daylight Time during daylight saving time.
  • Area code 925 became active on March 14, 1998, as a split from area code 510.
  • Area code 925 has no overlay code; area code 341 overlays 510 instead.
  • Mount Diablo State Park is in Contra Costa County within the 925 service region.
  • Saint Mary’s College of California is in Moraga, a community in the 925 area.
  • The U.S. Census Bureau does not publish population totals by telephone area code, so 925 has no official Census population count.