NICASIO — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 3 |
| T-MOBILE USA, INC. | 6529 | 2 |
| FRACTEL, LLC | 965H | 2 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1 |
| LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | 1 |