MADISON — WI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 61 |
| UNITED STATES CELLULAR - WI | 6274 | 21 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 17 |
| TDS METROCOM, LLC | 520K | 14 |
| ONVOY, LLC - WI | 225C | 12 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 61 |
| UNITED STATES CELLULAR - WI | 6274 | 21 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 17 |
| TDS METROCOM, LLC | 520K | 14 |
| ONVOY, LLC - WI | 225C | 12 |