KILLINGWTH — CT
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - CT | 639C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CT | 7143 | 1 |
| AT&T - LOCAL | 7421 | 1 |
| SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | 1 |
Data last updated: June 25, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - CT | 639C | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CT | 7143 | 1 |
| AT&T - LOCAL | 7421 | 1 |
| SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | 1 |