HAYWARD — CA
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| PACIFIC BELL | 9740 | 36 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 16 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | 15 |
| ONVOY, LLC - CA | 649C | 12 |
| METROPCS, INC. | 5562 | 10 |