HARTFORD — WI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 2 |
| BANDWIDTH.COM CLEC, LLC - WI | 007F | 1 |
| ONVOY, LLC - WI | 225C | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | 1 |
| UNITED STATES CELLULAR - WI | 6274 | 1 |