| District of Colorado area codes: 720 | |
|---|---|
| Country | United States |
| State/Province | Colorado |
| Major City | Denver |
| Time Zone | Mountain |
| Prefix | County | Primary City | Company |
|---|---|---|---|
| 720-963 | Jefferson | Denver, CO | Qwest Corporation |
| 720-965 | Jefferson | Denver, CO | T-mobile Usa |
| 720-971 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-972 | Adams | Denver, CO | Qwest Corporation |
| 720-974 | Jefferson | Denver, CO | Eschelon Telecom Of Colorado |
| 720-975 | Arapahoe | Aurora, CO | Eschelon Telecom Of Colorado |
| 720-977 | Adams | Denver, CO | Qwest Corporation |
| 720-979 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-980 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-981 | Jefferson | Denver, CO | Qwest Corporation |
| 720-982 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-984 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-985 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-987 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-988 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-989 | Denver | Denver, CO | Sprint Spectrum L.p. |
| 720-998 | Arapahoe | Aurora, CO | Comcast Phone Of Colorado |
| 720-999 | Jefferson | Denver, CO | Dishnet Wireline, L.l.c. |
| 720-555 | Used in movie | Denver, CO | Used in movie |
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.