COLUMBIA — CT
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 2 |
| COMCAST IP PHONE, LLC | 318J | 1 |
| ONVOY SPECTRUM, LLC | 624H | 1 |
| SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | 1 |