SANJOAQUIN — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 4420 | 3 |
| COMCAST IP PHONE, LLC | 318J | 1 |
| PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | 1 |
| METROPCS, INC. | 5562 | 1 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 1 |