| District of Colorado area codes: 720 | |
|---|---|
| Country | United States |
| State/Province | Colorado |
| Major City | Denver |
| Time Zone | Mountain |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 720-281 | Arapahoe | Aurora, CO | Cellco Partnership DBA Verizon Wireless |
| 720-282 | Arapahoe | Denver, CO | Tw Telecom Of Colorado LLC |
| 720-283 | Jefferson | Denver, CO | Qwest Corporation |
| 720-284 | Jefferson | Denver, CO | Xo Colorado |
| 720-285 | Arapahoe | Englewood, CO | Xo Colorado |
| 720-286 | Jefferson | Denver, CO | Teleport Communications America |
| 720-287 | Denver | Denver, CO | Comcast Phone Of Colorado |
| 720-288 | Denver | Aurora, CO | Bandwidth.com Clec |
| 720-289 | Jefferson | Denver, CO | New Cingular Wireless PCS |
| 720-290 | Jefferson | Denver, CO | Sprint Spectrum L.p. |
| 720-291 | Jefferson | Denver, CO | Sprint Spectrum L.p. |
| 720-292 | Jefferson | Denver, CO | New Cingular Wireless PCS |
| 720-293 | Adams | Denver, CO | Xo Colorado |
| 720-294 | Adams | Denver, CO | Xo Colorado |
| 720-295 | Denver | Denver, CO | Bandwidth.com Clec |
| 720-296 | Jefferson | Denver, CO | Leap Wireless Intl DBA Cricket Comm |
| 720-297 | Jefferson | Denver, CO | Leap Wireless Intl DBA Cricket Comm |
| 720-298 | Jefferson | Denver, CO | Leap Wireless Intl DBA Cricket Comm |
| 720-299 | Jefferson | Denver, CO | T-mobile Usa |
| 720-300 | Jefferson | Denver, CO | Sprint Spectrum L.p. |
There are 519 prefixes, In the code area, the major cities are Arvada, CO;Aurora, CO;Boulder, CO;Brighton, CO;Bro. The major city is Denver.