CEDAR HILL — TX
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - TX | 903C | 6 |
| SOUTHWESTERN BELL | 9533 | 5 |
| LEVEL 3 OF TELECOM OF TEXAS, LLC - TX | 7516 | 3 |
| LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | 2 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | 2 |