OCONOMOWOC — WI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 4 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | 3 |
| ONVOY, LLC - WI | 225C | 2 |
| T-MOBILE USA, INC. | 6529 | 2 |
| TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | 2 |