Area code 925
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).
Cities in the 925 area code
Contra Costa County
- Bay Point
- Bethel Island
- Blackhawk-Camino Tassajara
- Discovery Bay
- Marsh Creek Springs
- Norris Canyon
- Pleasant Hill
- Rock City
- San Ramon
- Shore Acres
- Walnut Creek
- Walnut Heights
- 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|