DALLAS — TX
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| SOUTHWESTERN BELL | 9533 | 479 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 63 |
| ONVOY, LLC - TX | 903C | 32 |
| LEVEL 3 COMMUNICATIONS, LLC - TX | 6114 | 26 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - TX | 7148 | 24 |