| District of California area codes: 925 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | Oakland |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 925-243 | Alameda | Livermore, CA | Pacific Bell |
| 925-244 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-245 | Alameda | Livermore, CA | Pacific Bell |
| 925-246 | Contra Costa | Concord, CA | Pacific Bell |
| 925-247 | Contra Costa | Moraga, CA | Pacific Bell |
| 925-248 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-249 | Alameda | Pleasanton, CA | Pacific Bell |
| 925-250 | Contra Costa | Concord, CA | Sprint Spectrum L.p. |
| 925-251 | Alameda | Pleasanton, CA | Pacific Bell |
| 925-252 | Contra Costa | Pittsburg, CA | Pacific Bell |
| 925-253 | Contra Costa | Orinda, CA | Pacific Bell |
| 925-254 | Contra Costa | Orinda, CA | Pacific Bell |
| 925-255 | Contra Costa | Orinda, CA | Mci Worldcom Communications, Ca |
| 925-256 | Contra Costa | Walnut Creek, CA | Pacific Bell |
| 925-257 | Contra Costa | Orinda, CA | Mcimetro Access Transmission Services LLC |
| 925-258 | Contra Costa | Orinda, CA | Pacific Bell |
| 925-259 | Contra Costa | Orinda, CA | Xo California |
| 925-260 | Contra Costa | Walnut Creek, CA | Sprint Spectrum L.p. |
| 925-261 | Contra Costa | Pittsburg, CA | Pacific Bell |
| 925-262 | Alameda | Oakland, CA | Global Crossing Local Services-ca |
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.