CONCORD — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 29 |
| METROPCS, INC. | 5562 | 9 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 8 |
| LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | 6 |
| ONVOY, LLC - CA | 649C | 5 |