WESTBRANCH — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 2 |
| MICHIGAN BELL TEL CO | 9323 | 2 |
| 123.NET, LLC | 2550 | 1 |
| OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | 1 |