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Area code 925

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Title: Area code 925  
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Subject: List of North American Numbering Plan area codes, Area code 510, Northern California, Area code 707, Contra Costa County, California
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Area code 925

Click on an area code in the map to go to the page for that area code. The area code in red is Area Code 925; all others in blue are California area codes.

Area code 925 is a California telephone area code that was split from area code 510 on March 14, 1998. It covers the inland portions of the East Bay counties of Alameda and Contra Costa in Northern California.

It was originally part of the 415 area code, one of the first three area codes created in California in 1947, which originally covered all of central California. In 1991 the 510 area code was created to encompass most of the East Bay. The 925 area code was created March 14, 1998, when the 510 area code was split along the natural border of the East Bay hills. The number was formed by taking 415 and adding 510 which equals 925.

The area code 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).

Contents

  • Cities in the 925 area code 1
    • Alameda County 1.1
    • Contra Costa County 1.2
  • See also 2
  • External links 3

Cities in the 925 area code

Alameda County

Contra Costa County

See also

External links

  • NANPA Area Code Map of California
  • Report on the 925 area code produced by the California Public Utilities Commission, Telecommunications Division
  • List of exchanges from AreaCodeDownload.com, 925 Area Code
California area codes: 209, 213, 310/424, 323, 408/669, 415, 442/760, 510, 530, 559, 562, 619, 626, 650, 657/714, 661, 707, 747/818, 805, 831, 858, 909, 916, 925, 949, 951
North: 707, 916
West: 510 area code 925 East: 209
South: 408/669

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