| District of California area codes: 925 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | Oakland |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 925-200 | Alameda | Pleasanton, CA | Cellco Partnership DBA Verizon Wireless |
| 925-201 | Alameda | Pleasanton, CA | Mpower Communications Corp |
| 925-202 | Alameda | Pleasanton, CA | Sprint Spectrum L.p. |
| 925-203 | Contra Costa | Pittsburg, CA | New Cingular Wireless PCS |
| 925-205 | Contra Costa | Antioch, CA | American Messaging Services |
| 925-206 | Contra Costa | Antioch, CA | Cellco Partnership DBA Verizon Wireless |
| 925-207 | Contra Costa | Concord, CA | Sprint Spectrum L.p. |
| 925-208 | Contra Costa | Danville, CA | Teleport Communications Group - San Francisco |
| 925-209 | Alameda | Pleasanton, CA | Sprint Spectrum L.p. |
| 925-210 | Contra Costa | Walnut Creek, CA | Pacific Bell |
| 925-212 | Contra Costa | Walnut Creek, CA | New Cingular Wireless PCS |
| 925-213 | Contra Costa | Walnut Creek, CA | Usa Mobility Wireless |
| 925-215 | Alameda | Livermore, CA | Broadwing Communications |
| 925-216 | Contra Costa | San Ramon, CA | New Cingular Wireless PCS |
| 925-217 | Contra Costa | Danville, CA | Broadwing Communications |
| 925-218 | Alameda | Pleasanton, CA | Broadwing Communications |
| 925-219 | Contra Costa | Antioch, CA | Broadwing Communications |
| 925-220 | Contra Costa | Walnut Creek, CA | American Messaging Services |
| 925-221 | Contra Costa | Walnut Creek, CA | 33 Wireless Inc. |
| 925-222 | Contra Costa | Concord, CA | Cf Communications DBA Telekenex |
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.