MARTINEZ — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 7 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 3 |
| U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | 2 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 2 |
| MATRIX TELECOM, LLC. S/I/I TNCI - CA | 7379 | 2 |