MONTROSE — CO
Data last updated: March 10, 2026
Area Codes
Top Carriers
| Carrier | OCN | NXX Count |
|---|---|---|
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 6567 | 5 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 3 |
| QWEST CORPORATION | 9636 | 3 |
| ONVOY, LLC - CO | 026D | 2 |
| METROPCS, INC. | 5562 | 2 |