CORNWALL — CT
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | 1 |
| ONVOY, LLC - CT | 639C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CT | 7143 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1 |