FILLMORE — CA
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 3 |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 2 |
| ONVOY SPECTRUM, LLC | 624H | 1 |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 1 |
| NORTH COUNTY COMMUNICATION CORPORATION - CA | 7894 | 1 |