ST CHARLES — MO
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| SOUTHWESTERN BELL | 9533 | 11 |
| ONVOY, LLC - MO | 093F | 5 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO | 7432 | 5 |
| LEVEL 3 COMMUNICATIONS, LLC - MO | 4932 | 4 |
| T-MOBILE USA, INC. | 6529 | 4 |