| District of California area codes: 925 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | Oakland |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 925-223 | Alameda | Pleasanton, CA | Mcimetro Access Transmission Services LLC |
| 925-224 | Alameda | Pleasanton, CA | Pacific Bell |
| 925-225 | Alameda | Pleasanton, CA | Pacific Bell |
| 925-226 | Alameda | Fremont, CA | Xo California |
| 925-227 | Alameda | Pleasanton, CA | Pacific Bell |
| 925-228 | Contra Costa | Martinez, CA | Pacific Bell |
| 925-229 | Contra Costa | Martinez, CA | Pacific Bell |
| 925-230 | Contra Costa | San Ramon, CA | Level 3 Communications |
| 925-231 | Contra Costa | Martinez, CA | Level 3 Communications |
| 925-232 | Contra Costa | Pittsburg, CA | Level 3 Communications |
| 925-233 | Alameda | Sunol, CA | Level 3 Communications |
| 925-234 | Contra Costa | Antioch, CA | Level 3 Communications |
| 925-235 | Contra Costa | Moraga, CA | Level 3 Communications |
| 925-236 | Contra Costa | San Ramon, CA | Broadwing Communications |
| 925-237 | Contra Costa | Antioch, CA | Xo California |
| 925-238 | Contra Costa | Antioch, CA | Comcast Phone Of California |
| 925-239 | Contra Costa | Walnut Creek, CA | Peerless Network Of California |
| 925-240 | Contra Costa | Brentwood, CA | Pacific Bell |
| 925-241 | Contra Costa | San Ramon, CA | Mcimetro Access Transmission Services LLC |
| 925-242 | 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.