DIAMONDBAR — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| FRONTIER CALIFORNIA INC. | 2319 | 12 |
| ONVOY, LLC - CA | 649C | 3 |
| BANDWIDTH.COM CLEC, LLC - CA | 981E | 3 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 2 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | 2 |