| District of California area codes: 925 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | Oakland |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 925-791 | Contra Costa | Concord, CA | U.s. Telepacific Corp. |
| 925-794 | Contra Costa | Moraga, CA | O1 Communications |
| 925-798 | Contra Costa | Concord, CA | Pacific Bell |
| 925-800 | Alameda | Livermore, CA | O1 Communications |
| 925-803 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-804 | Contra Costa | San Ramon, CA | Teleport Communications Group - San Francisco |
| 925-806 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-807 | Contra Costa | San Ramon, CA | Xo California |
| 925-808 | Contra Costa | Concord, CA | Pacific Bell |
| 925-809 | Contra Costa | Brentwood, CA | U.s. Telepacific Corp. |
| 925-812 | Contra Costa | Martinez, CA | Metro PCS |
| 925-813 | Contra Costa | Antioch, CA | Cellco Partnership DBA Verizon Wireless |
| 925-815 | Contra Costa | Danville, CA | Pacific Bell |
| 925-817 | Contra Costa | Walnut Creek, CA | Pacific Bell |
| 925-818 | Contra Costa | Walnut Creek, CA | New Cingular Wireless PCS |
| 925-819 | Contra Costa | San Ramon, CA | New Cingular Wireless PCS |
| 925-820 | Contra Costa | Danville, CA | Pacific Bell |
| 925-822 | Contra Costa | Concord, CA | Mcimetro Access Transmission Services LLC |
| 925-823 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-824 | Contra Costa | San Ramon, CA | Pacific Bell |
There are 552 prefixes, In the code area, the major cities are Antioch, CA;Bay Point, CA;Brentwood, CA;Concord, C. The major city is Oakland.