SUSSEX — WI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 2 |
| LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | 1 |
| TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 1 |
| LEVEL 3 TELECOM OF WISCONSIN, LP - WI | 7322 | 1 |