CHELSEA — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLCV - MI | 543C | 2 |
| MICHIGAN BELL TEL CO | 9323 | 2 |
| COMCAST IP PHONE, LLC | 318J | 1 |
| LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | 1 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | 1 |