CEDARBURG — WI
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| WISCONSIN BELL INC | 9327 | 5 |
| ONVOY, LLC - WI | 225C | 3 |
| LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | 2 |
| PAETEC ITEL, LLC | 829J | 2 |
| TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | 1 |