| City Name | County Name: | Population | Median Age |
| Acres Green | Douglas | 3,100 | 40.2 |
| Aetna Estates | Arapahoe | 1,398 | 24.8 |
| Air Force Academy | El Paso | 6,512 | 21.1 |
| Akron | Washington | 1,723 | 35.6 |
| Alamosa | Alamosa | 10,652 | 28.4 |
| Alamosa East | Alamosa | 1,295 | 33 |
| Applewood | Jefferson | 8,081 | 40.9 |
| Aristocrat Ranchettes | Weld | 1,416 | 36.9 |
| Arvada | Jefferson | 121,272 | 40.2 |
| Aspen | Pitkin | 8,569 | 41.8 |
| Ault | Weld | 1,871 | 33.8 |
| Aurora | Adams | 379,289 | 34.4 |
| Avon | Eagle | 6,511 | 32.4 |
| Basalt | Eagle | 9,193 | 47.8 |
| Battlement Mesa | Garfield | 5,116 | 36.2 |
| Bayfield | La Plata | 2,970 | 34.4 |
| Bennett | Adams | 2,798 | 37.6 |
| Berkley | Adams | 11,879 | 33.6 |
| Berthoud | Larimer | 9,094 | 37.3 |
| Black Forest | El Paso | 14,081 | 48.3 |
| Boulder | Boulder | 124,345 | 28.6 |
| Breckenridge | Summit | 7,818 | 32.2 |
| Brighton | Adams | 41,554 | 33.2 |
| Broomfield | Broomfield | 70,465 | 37.8 |
| Brush | Morgan | 5,769 | 32.2 |
| Buena Vista | Chaffee | 4,910 | 45.4 |
| Burlington | Kit Carson | 3,140 | 38.2 |
| Byers | Arapahoe | 1,344 | 42.1 |
| Caņon City | Fremont | 27,676 | 44.2 |
| Carbondale | Garfield | 7,684 | 36.9 |
| Cascade-Chipita Park | El Paso | 1,233 | 53.5 |
| Castle Pines | Douglas | 10,763 | 42.2 |
| Castle Pines Village | Douglas | 4,553 | 49.8 |
| Castle Rock | Douglas | 68,484 | 35.8 |
| Cedaredge | Delta | 3,616 | 48.6 |
| Centennial | Arapahoe | 110,937 | 41.3 |
| Center | Saguache | 2,264 | 32.6 |
| Cherry Creek | Arapahoe | 12,496 | 39.5 |
| Cherry Hills Village | Arapahoe | 6,647 | 46.4 |
| Cimarron Hills | El Paso | 18,727 | 32.4 |
| Clifton | Mesa | 20,748 | 32.8 |
| Coal Creek | Jefferson | 2,313 | 45.1 |
| Colorado City | Pueblo | 2,347 | 36.3 |
| Colorado Springs | El Paso | 642,413 | 34.7 |
| Columbine | Jefferson | 25,332 | 43.4 |
| Columbine Valley | Arapahoe | 1,499 | 54.4 |
| Commerce City | Adams | 60,336 | 31.6 |
| Cortez | Montezuma | 8,736 | 38.9 |
| Craig | Moffat | 9,553 | 36.6 |
| Crested Butte | Gunnison | 1,723 | 34.4 |
| Cripple Creek | Teller | 1,258 | 51.6 |
| Dacono | Weld | 6,034 | 32 |
| Dakota Ridge | Jefferson | 34,659 | 40.3 |
| Del Norte | Rio Grande | 1,568 | 48.2 |
| Delta | Delta | 8,995 | 43.3 |
| Denver | Denver | 2,876,620 | 34.5 |
| Derby | Adams | 8,962 | 30.2 |
| Dove Valley | Arapahoe | 5,673 | 29.2 |
| Durango | La Plata | 20,203 | 34.5 |
| Eagle | Eagle | 6,986 | 32.8 |
| Eaton | Weld | 5,773 | 36.9 |
| Edgewater | Jefferson | 5,335 | 33.6 |
| Edwards | Eagle | 9,350 | 37.6 |
| El Jebel | Eagle | 4,725 | 35.9 |
| Elizabeth | Elbert | 1,566 | 40.8 |
| Englewood | Arapahoe | 34,917 | 36.4 |
| Erie | Boulder | 27,003 | 37.1 |
| Estes Park | Larimer | 7,769 | 61.3 |
| Evans | Weld | 21,205 | 29.1 |
| Evergreen | Jefferson | 8,885 | 46.7 |
| Fairmount | Jefferson | 8,606 | 43.6 |
| Federal Heights | Adams | 12,827 | 30.8 |
| Firestone | Weld | 34,230 | 35.3 |
| Florence | Fremont | 7,433 | 42.3 |
| Floyd Hill | Clear Creek | 1,102 | 46.2 |
| Fort Carson | El Paso | 14,951 | 21.7 |
| Fort Collins | Larimer | 312,666 | 29.3 |
| Fort Lupton | Weld | 10,208 | 32.6 |
| Fort Morgan | Morgan | 13,349 | 32.5 |
| Fountain | El Paso | 30,735 | 29.9 |
| Fowler | Otero | 1,141 | 42.4 |
| Fraser | Grand | 2,798 | 30.9 |
| Frederick | Weld | 13,960 | 35.8 |
| Frisco | Summit | 3,174 | 48 |
| Fruita | Mesa | 13,478 | 38.4 |
| Fruitvale | Mesa | 7,874 | 40.6 |
| Genesee | Jefferson | 3,910 | 53.4 |
| Georgetown | Clear Creek | 1,112 | 47.1 |
| Gilcrest | Weld | 1,106 | 32.7 |
| Glendale | Arapahoe | 5,141 | 30.8 |
| Gleneagle | El Paso | 6,885 | 45.2 |
| Glenwood Springs | Garfield | 11,962 | 37.1 |
| Golden | Jefferson | 20,767 | 33.5 |
| Granby | Grand | 2,139 | 44.7 |
| Grand Junction | Mesa | 139,143 | 37.1 |
| Greeley | Weld | 137,810 | 31.5 |
| Greenwood Village | Arapahoe | 15,735 | 42.1 |
| Gunbarrel | Boulder | 10,202 | 40.2 |
| Gunnison | Gunnison | 7,195 | 25.4 |
| Gypsum | Eagle | 7,375 | 44.4 |
| Hayden | Routt | 1,979 | 40.1 |
| Highlands Ranch | Douglas | 105,631 | 39.8 |
| Holly Hills | Arapahoe | 2,835 | 45.2 |
| Holyoke | Phillips | 2,208 | 32.6 |
| Hudson | Weld | 2,767 | 33.7 |
| Idaho Springs | Clear Creek | 1,786 | 43.4 |
| Indian Hills | Jefferson | 1,398 | 37.3 |
| Inverness | Arapahoe | 1,567 | 33.8 |
| Johnstown | Weld | 21,048 | 34.1 |
| Julesburg | Sedgwick | 1,152 | 40.7 |
| Keenesburg | Weld | 1,237 | 37.5 |
| Ken Caryl | Jefferson | 34,040 | 41.3 |
| Kersey | Weld | 1,681 | 33.5 |
| Kremmling | Grand | 1,524 | 39.2 |
| La Junta | Otero | 7,963 | 38.9 |
| La Salle | Weld | 2,342 | 32.9 |
| Lafayette | Boulder | 99,645 | 39.3 |
| Lakewood | Jefferson | 157,935 | 38.6 |
| Lamar | Prowers | 7,655 | 37.1 |
| Laporte | Larimer | 2,413 | 49.3 |
| Las Animas | Bent | 3,622 | 41.1 |
| Leadville | Lake | 5,554 | 36 |
| Leadville North | Lake | 2,244 | 33.5 |
| Limon | Lincoln | 1,952 | 49.7 |
| Lincoln Park | Fremont | 3,283 | 51.1 |
| Littleton | Arapahoe | 48,065 | 41 |
| Lochbuie | Weld | 7,304 | 29.4 |
| Lone Tree | Douglas | 13,082 | 40 |
| Longmont | Boulder | 102,474 | 38.1 |
| Louisville | Boulder | 20,816 | 41.6 |
| Loveland | Larimer | 78,877 | 39.9 |
| Lyons | Boulder | 2,189 | 41.4 |
| Manassa | Conejos | 1,001 | 36.7 |
| Mancos | Montezuma | 1,430 | 34.5 |
| Manitou Springs | El Paso | 5,390 | 42.7 |
| Mead | Weld | 4,731 | 33.8 |
| Meeker | Rio Blanco | 2,252 | 38.2 |
| Meridian | Douglas | 3,640 | 32.8 |
| Milliken | Weld | 8,164 | 36.3 |
| Minturn | Eagle | 1,145 | 35.7 |
| Monte Vista | Rio Grande | 4,179 | 38.5 |
| Montrose | Montrose | 23,478 | 43.6 |
| Monument | El Paso | 8,097 | 34.8 |
| Mountain Village | San Miguel | 1,426 | 32.1 |
| Nederland | Boulder | 1,533 | 41.6 |
| New Castle | Garfield | 6,275 | 32.2 |
| Niwot | Boulder | 3,870 | 46.7 |
| Northglenn | Adams | 38,819 | 32.5 |
| Olathe | Montrose | 1,837 | 40.7 |
| Orchard City | Delta | 3,212 | 54.3 |
| Orchard Mesa | Mesa | 6,719 | 41.9 |
| Ordway | Crowley | 1,054 | 41.6 |
| Ouray | Ouray | 1,034 | 46 |
| Pagosa Springs | Archuleta | 5,927 | 34.3 |
| Palisade | Mesa | 2,736 | 38.8 |
| Palmer Lake | El Paso | 2,993 | 40.1 |
| Paonia | Delta | 1,469 | 55.9 |
| Parachute | Garfield | 1,116 | 32.8 |
| Parker | Douglas | 57,706 | 34.7 |
| Penrose | Fremont | 3,034 | 47.5 |
| Perry Park | Douglas | 1,972 | 58.2 |
| Pierce | Weld | 1,133 | 38.2 |
| Platteville | Weld | 2,760 | 32.3 |
| Ponderosa Park | Elbert | 3,636 | 47 |
| Pueblo | Pueblo | 143,932 | 37.7 |
| Pueblo West | Pueblo | 31,849 | 40.4 |
| Rangely | Rio Blanco | 2,263 | 34.6 |
| Redlands | Mesa | 8,765 | 51.5 |
| Ridgway | Ouray | 1,039 | 50.1 |
| Rifle | Garfield | 11,089 | 32.4 |
| Rocky Ford | Otero | 4,011 | 34.8 |
| Roxborough Park | Douglas | 9,523 | 40.5 |
| Salida | Chaffee | 7,740 | 47.2 |
| Security-Widefield | El Paso | 39,612 | 32.9 |
| Severance | Weld | 6,494 | 35.1 |
| Shaw Heights | Adams | 5,529 | 35.7 |
| Sheridan | Arapahoe | 6,183 | 36.2 |
| Sherrelwood | Adams | 19,208 | 34.4 |
| Silt | Garfield | 3,228 | 30.8 |
| Silverthorne | Summit | 19,344 | 46.1 |
| Snowmass Village | Pitkin | 2,732 | 49.3 |
| Springfield | Baca | 1,375 | 38.8 |
| Steamboat Springs | Routt | 14,087 | 37 |
| Sterling | Logan | 15,780 | 34.6 |
| Stonegate | Douglas | 9,847 | 35.8 |
| Strasburg | Arapahoe | 3,013 | 39.9 |
| Stratmoor | El Paso | 6,484 | 33.2 |
| Superior | Boulder | 13,087 | 35.9 |
| Telluride | San Miguel | 2,479 | 35.5 |
| The Pinery | Douglas | 10,806 | 47 |
| Thornton | Adams | 141,464 | 33.8 |
| Timnath | Larimer | 4,998 | 35.2 |
| Todd Creek | Adams | 4,365 | 43.4 |
| Towaoc | Montezuma | 1,153 | 24.9 |
| Trinidad | Las Animas | 8,276 | 41.8 |
| Twin Lakes | Adams | 8,196 | 38 |
| Vail | Eagle | 5,964 | 43.6 |
| Walsenburg | Huerfano | 3,029 | 49.8 |
| Welby | Adams | 16,018 | 31.9 |
| Wellington | Larimer | 10,437 | 32.6 |
| West Pleasant View | Jefferson | 5,173 | 28.3 |
| Westminster | Adams | 113,166 | 36.6 |
| Wheat Ridge | Jefferson | 31,324 | 41.2 |
| Wiggins | Morgan | 1,163 | 34.1 |
| Windsor | Weld | 30,477 | 38.9 |
| Winter Park | Grand | 1,090 | 39.9 |
| Woodland Park | Teller | 11,530 | 46.1 |
| Woodmoor | El Paso | 9,345 | 44 |
| Wray | Yuma | 2,349 | 36.4 |
| Yuma | Yuma | 3,479 | 33.2 |