GUILFORD — CT
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT | 9147 | 3 |
| ONVOY, LLC - CT | 639C | 2 |
| BANDWIDTH.COM CLEC, LLC - CT | 199F | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - CT | 4800 | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CT | 7143 | 1 |