ROYAL OAK — MI
Data last updated: June 25, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| MICHIGAN BELL TEL CO | 9323 | 36 |
| NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | 12 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | 10 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | 6 |
| LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | 5 |