720 area code is a telephone area code in the North American Numbering Plan (NANP) for the Denver and several surrounding suburbs in parts of north-central Colorado, United States. The area code was created in 1998.
| Area Code | 720 |
|---|---|
| Major City | Denver |
| Service Date | 06/01/1998 |
| Time Zone | Mountain |
| Overlay Complex | 303/720/983 |
| Location | Colorado (CO) |
| Country | United States |
Some of the cities served by area code 720 include Wilmington, Dover, Newark, Bear, Middletown, Brookside, Glasgow, Hockessin, Pike Creek Valley and more.
| Area code | City/Town | County |
|---|---|---|
| 720 | Allenspark | Boulder |
| 720 | Arvada | Jefferson |
| 720 | Aurora | Adams |
| 720 | Bailey | Park |
| 720 | Bennett | Adams |
| 720 | Black Hawk | Gilpin |
| 720 | Bond | Eagle |
| 720 | Boulder | Boulder |
| 720 | Brighton | Adams |
| 720 | Broomfield | Broomfield |
| 720 | Buffalo Creek | Jefferson |
| 720 | Byers | Arapahoe |
| 720 | Castle Rock | Douglas |
| 720 | Central City | Gilpin |
| 720 | Commerce City | Adams |
| 720 | Conifer | Jefferson |
| 720 | Dacono | Weld |
| 720 | Deer Trail | Arapahoe |
| 720 | Denver | Adams |
| 720 | Dumont | Clear Creek |
| 720 | Dupont | Adams |
| 720 | Eastlake | Adams |
| 720 | Elbert | El Paso |
| 720 | Eldorado Springs | Boulder |
| 720 | Elizabeth | Elbert |
| 720 | Empire | Clear Creek |
| 720 | Englewood | Arapahoe |
| 720 | Erie | Weld |
| 720 | Evergreen | Jefferson |
| 720 | Firestone | Weld |
| 720 | Fort Lupton | Weld |
| 720 | Franktown | Douglas |
| 720 | Frederick | Weld |
| 720 | Georgetown | Clear Creek |
| 720 | Golden | Jefferson |
| 720 | Grant | Park |
| 720 | Henderson | Adams |
| 720 | Hereford | Weld |
| 720 | Highlands Ranch | Douglas |
| 720 | Hudson | Weld |
| 720 | Hygiene | Boulder |
| 720 | Idaho Springs | Clear Creek |
| 720 | Idledale | Jefferson |
| 720 | Indian Hills | Jefferson |
| 720 | Jamestown | Boulder |
| 720 | Keenesburg | Weld |
| 720 | Kiowa | Elbert |
| 720 | Kittredge | Jefferson |
| 720 | Lafayette | Boulder |
| 720 | Lakewood | Jefferson |
| 720 | Larkspur | Douglas |
| 720 | Littleton | Arapahoe |
| 720 | Longmont | Boulder |
| 720 | Louisville | Boulder |
| 720 | Louviers | Douglas |
| 720 | Lyons | Boulder |
| 720 | Morrison | Jefferson |
| 720 | Nederland | Boulder |
| 720 | Niwot | Boulder |
| 720 | Parker | Douglas |
| 720 | Pine | Jefferson |
| 720 | Pinecliffe | Boulder |
| 720 | Roggen | Weld |
| 720 | Rollinsville | Gilpin |
| 720 | Sedalia | Douglas |
| 720 | Sedgwick | Sedgwick |
| 720 | Shawnee | Park |
| 720 | Silver Plume | Clear Creek |
| 720 | Strasburg | Adams |
| 720 | Thornton | Adams |
| 720 | Ward | Boulder |
| 720 | Watkins | Adams |
| 720 | Westminster | Adams |
| 720 | Wheat Ridge | Jefferson |