| District of California area codes: 925 | |
|---|---|
| Country | United States |
| State/Province | California |
| Major City | Oakland |
| Time Zone | Pacific |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 925-686 | Contra Costa | Concord, CA | Pacific Bell |
| 925-687 | Contra Costa | Concord, CA | Pacific Bell |
| 925-688 | Contra Costa | Concord, CA | Pacific Bell |
| 925-689 | Contra Costa | Concord, CA | Pacific Bell |
| 925-690 | Contra Costa | Clayton, CA | Mcimetro Access Transmission Services LLC |
| 925-691 | Contra Costa | Concord, CA | Pacific Bell |
| 925-692 | Contra Costa | Concord, CA | Pacific Bell |
| 925-693 | Contra Costa | Clayton, CA | Teleport Communications Group - San Francisco |
| 925-694 | Alameda | Pleasanton, CA | Mcimetro Access Transmission Services LLC |
| 925-695 | Contra Costa | Concord, CA | Mpower Communications Corp |
| 925-698 | Contra Costa | Pittsburg, CA | New Cingular Wireless PCS |
| 925-699 | Alameda | Pleasanton, CA | New Cingular Wireless PCS |
| 925-701 | Alameda | Pleasanton, CA | U.s. Telepacific Corp. |
| 925-705 | Contra Costa | Walnut Creek, CA | Metro PCS |
| 925-706 | Contra Costa | Antioch, CA | Pacific Bell |
| 925-708 | Contra Costa | Walnut Creek, CA | Cellco Partnership DBA Verizon Wireless |
| 925-709 | Contra Costa | Pittsburg, CA | Pacific Bell |
| 925-718 | Contra Costa | Danville, CA | O1 Communications |
| 925-719 | Contra Costa | San Ramon, CA | Cellco Partnership DBA Verizon Wireless |
| 925-723 | Contra Costa | Martinez, CA | Mpower Communications Corp |
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.