ST HELENA — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 4 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 2 |
| ONVOY, LLC - CA | 649C | 2 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | 1 |