BOULDER — MT
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - MT | 453F | 2 |
| LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | 1 |
| QWEST CORPORATION | 9636 | 1 |
Data last updated: March 10, 2026
| Carrier | OCN | NXX Count |
|---|---|---|
| ONVOY, LLC - MT | 453F | 2 |
| LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | 1 |
| QWEST CORPORATION | 9636 | 1 |