JEFFERSON — WI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| T-MOBILE USA, INC. | 6529 | 2 |
| WISCONSIN BELL INC | 9327 | 2 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | 1 |
| AMERICAN MESSAGING SERVICES, LLC | 9748 | 1 |