| District of California area codes: 925 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | Oakland |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 925-347 | Alameda | Livermore, CA | American Messaging (am) |
| 925-348 | Contra Costa | Concord, CA | New Cingular Wireless PCS |
| 925-349 | Contra Costa | Concord, CA | Teleport Communications Group - San Francisco |
| 925-350 | Contra Costa | Antioch, CA | Comcast Phone Of California |
| 925-351 | Alameda | Pleasanton, CA | Sprint Spectrum L.p. |
| 925-352 | Alameda | Pleasanton, CA | Sprint Spectrum L.p. |
| 925-353 | Alameda | Fremont, CA | New Cingular Wireless PCS |
| 925-354 | Contra Costa | Antioch, CA | New Cingular Wireless PCS |
| 925-355 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-356 | Contra Costa | Concord, CA | Pacific Bell |
| 925-357 | Contra Costa | Walnut Creek, CA | Level 3 Communications |
| 925-358 | Contra Costa | San Ramon, CA | Pacific Bell |
| 925-359 | Contra Costa | San Ramon, CA | Mcimetro Access Transmission Services LLC |
| 925-360 | Contra Costa | Walnut Creek, CA | New Cingular Wireless PCS |
| 925-361 | Contra Costa | San Ramon, CA | Teleport Communications Group - San Francisco |
| 925-362 | Contra Costa | Danville, CA | Pacific Bell |
| 925-363 | Contra Costa | Concord, CA | Pacific Bell |
| 925-364 | Alameda | Hayward, CA | Mci Worldcom Communications, Ca |
| 925-365 | Contra Costa | San Ramon, CA | Teleport Communications Group - San Francisco |
| 925-366 | Alameda | Pleasanton, CA | Sprint Spectrum L.p. |
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.