Colorado Area Codes
Data last updated: August 31, 2026
Area Codes in Colorado
| NPA | Major Cities | Status | Exchanges | Overlay |
|---|---|---|---|---|
| 303 | Denver, Englewood, Aurora | Active | 784 | Yes |
| 719 | Colorado Springs, Pueblo, Hugo | Active | 785 | No |
| 720 | Denver, Aurora, Fort Collins | Active | 785 | Yes |
| 748 | Colorado | Active | 786 | Yes |
| 970 | Denver, Fort Collins, Grand Junction | Active | 786 | Yes |
| 983 | Denver, Fort Collins | Active | 786 | Yes |
Top Carriers in Colorado
| Carrier | OCN | NXX Count |
|---|---|---|
| QWEST CORPORATION | 9636 | 903 |
| T-MOBILE USA, INC. | 6529 | 291 |
| CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO | 6567 | 276 |
| ONVOY, LLC - CO | 026D | 244 |
| NEW CINGULAR WIRELESS PCS, LLC | 6010 | 244 |
| LEVEL 3 COMMUNICATIONS, LLC - CO | 6118 | 185 |
| MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | 101 |
| BANDWIDTH.COM CLEC, LLC - CO | 078F | 94 |
| TELEPORT COMMUNICATIONS AMERICA, LLC - CO | 7378 | 81 |
| CENTURYTEL OF EAGLE, INC. DBA CENTURYLINK | 2185 | 55 |