WASHINGTON — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| MICHIGAN BELL TEL CO | 9323 | 4 |
| ONVOY, LLCV - MI | 543C | 2 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | 2 |
| AT&T ENTERPRISES, LLC | 516C | 1 |
| TON80 COMMUNICATIONS, LLC | 516J | 1 |