ATASCADERO — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| T-MOBILE USA, INC. | 6529 | 9 |
| PACIFIC BELL | 9740 | 6 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 3 |
| BOOST SUBSCRIBERCO L.L.C. | 490J | 1 |
| ONVOY, LLC - CA | 649C | 1 |