SANJOAQUIN — CA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 4420 | 3 |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 1 |
| COMCAST PHONE OF CALIFORNIA, LLC | 394L | 1 |
| METROPCS, INC. | 5562 | 1 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1 |