| City | Population |
| Acres Green, CO | 3,007 |
| Adams County rural, CO | 126,508 |
| Aetna Estates, CO | 834 |
| Allenspark, CO | 528 |
| Altona, CO | 501 |
| Applewood, CO | 7,160 |
| Arapahoe County rural, CO | 15,294 |
| Aristocrat Ranchettes, CO | 1,344 |
| Arriba town, CO | 193 |
| Arvada, CO | 106,433 |
| Aspen Park, CO | 882 |
| Ault town, CO | 1,519 |
| Aurora, CO | 325,078 |
| Bark Ranch, CO | 213 |
| Bennett town, CO | 2,308 |
| Berkley, CO | 11,207 |
| Berthoud town, CO | 5,105 |
| Black Hawk, CO | 118 |
| Blue Sky, CO | 24 |
| Bonanza Mountain Estates, CO | 128 |
| Boulder, CO | 97,385 |
| Boulder County rural, CO | 31,515 |
| Bow Mar town, CO | 866 |
| Brick Center, CO | 107 |
| Brighton, CO | 33,352 |
| Broomfield, CO | 55,889 |
| Brush, CO | 5,463 |
| Byers, CO | 1,160 |
| Castle Pines, CO | 3,614 |
| Castle Pines North, CO | 10,360 |
| Castle Rock town, CO | 48,231 |
| Centennial, CO | 100,377 |
| Central City, CO | 663 |
| Cherry Creek, CO | 11,120 |
| Cherry Hills Village, CO | 5,987 |
| Coal Creek, CO | 2,400 |
| Columbine, CO | 24,280 |
| Columbine Valley town, CO | 1,256 |
| Comanche Creek, CO | 369 |
| Commerce City, CO | 45,913 |
| Crisman, CO | 186 |
| Dacono, CO | 4,152 |
| Dakota Ridge, CO | 32,005 |
| Deer Trail town, CO | 546 |
| Denver, CO | 600,158 |
| Derby, CO | 7,685 |
| Douglas County rural, CO | 33,121 |
| Dove Valley, CO | 5,243 |
| Downieville-Lawson-Dumont, CO | 594 |
| East Pleasant View, CO | 356 |
| Eaton town, CO | 4,365 |
| Edgewater, CO | 5,170 |
| Elbert, CO | 230 |
| Elbert County rural, CO | 16,925 |
| Eldora, CO | 142 |
| Eldorado Springs, CO | 585 |
| Elizabeth town, CO | 1,358 |
| Englewood, CO | 30,255 |
| Erie town, CO | 18,135 |
| Estes Park town, CO | 5,858 |
| Evans, CO | 18,537 |
| Evergreen, CO | 9,038 |
| Fairmount, CO | 7,559 |
| Federal Heights, CO | 11,467 |
| Firestone town, CO | 10,147 |
| Floyd Hill, CO | 998 |
| Fort Collins, CO | 143,986 |
| Fort Lupton, CO | 7,377 |
| Fort Morgan, CO | 11,315 |
| Foxfield town, CO | 685 |
| Franktown, CO | 395 |
| Frederick town, CO | 8,679 |
| Garden City town, CO | 234 |
| Genesee, CO | 3,609 |
| Genoa town, CO | 139 |
| Gilcrest town, CO | 1,034 |
| Gilpin County rural, CO | 1,946 |
| Glendale, CO | 4,184 |
| Glendale, CO | 69 |
| Gold Hill, CO | 230 |
| Golden, CO | 18,867 |
| Grand View Estates, CO | 528 |
| Greeley, CO | 92,889 |
| Greenwood Village, CO | 13,925 |
| Gunbarrel, CO | 9,263 |
| Hidden Lake, CO | 31 |
| Highlands Ranch, CO | 96,713 |
| Hillrose town, CO | 264 |
| Holly Hills, CO | 2,521 |
| Hudson town, CO | 2,356 |
| Idaho Springs, CO | 1,717 |
| Idledale, CO | 252 |
| Indian Hills, CO | 1,280 |
| Inverness, CO | 1,532 |
| Jackson Lake, CO | 154 |
| Jamestown town, CO | 274 |
| Johnstown town, CO | 9,887 |
| Keenesburg town, CO | 1,127 |
| Ken Caryl, CO | 32,438 |
| Kersey town, CO | 1,454 |
| Kiowa town, CO | 723 |
| Kittredge, CO | 1,304 |
| La Salle town, CO | 1,955 |
| Lafayette, CO | 24,453 |
| Lakeside town, CO | 8 |
| Lakewood, CO | 142,980 |
| Laporte, CO | 2,450 |
| Larkspur town, CO | 183 |
| Lazy Acres, CO | 920 |
| Leyner, CO | 29 |
| Limon town, CO | 1,880 |
| Littleton, CO | 41,737 |
| Lochbuie town, CO | 4,726 |
| Log Lane Village town, CO | 873 |
| Lone Tree, CO | 10,218 |
| Longmont, CO | 86,270 |
| Louisville, CO | 18,376 |
| Louviers, CO | 269 |
| Loveland, CO | 66,859 |
| Lyons town, CO | 2,033 |
| Mead town, CO | 3,405 |
| Meridian, CO | 2,970 |
| Milliken town, CO | 5,610 |
| Morgan County rural, CO | 8,431 |
| Morgan Heights, CO | 266 |
| Morrison town, CO | 428 |
| Mountain Meadows, CO | 274 |
| Mountain View town, CO | 507 |
| Nederland town, CO | 1,445 |
| Niwot, CO | 4,006 |
| North Washington, CO | 484 |
| Northglenn, CO | 35,789 |
| Nunn town, CO | 416 |
| Orchard, CO | 90 |
| Paragon Estates, CO | 928 |
| Parker town, CO | 45,297 |
| Peoria, CO | 163 |
| Perry Park, CO | 1,646 |
| Pierce town, CO | 834 |
| Pine Brook Hill, CO | 983 |
| Platteville town, CO | 2,485 |
| Ponderosa Park, CO | 3,232 |
| Rollinsville, CO | 181 |
| Roxborough Park, CO | 9,099 |
| Saddle Ridge, CO | 56 |
| Sedalia, CO | 206 |
| Seven Hills, CO | 121 |
| Severance town, CO | 3,165 |
| Shaw Heights, CO | 5,116 |
| Sheridan, CO | 5,664 |
| Sherrelwood, CO | 18,287 |
| Snyder, CO | 132 |
| St. Ann Highlands, CO | 288 |
| St. Mary's, CO | 283 |
| Stonegate, CO | 8,962 |
| Strasburg, CO | 2,447 |
| Sugarloaf, CO | 261 |
| Sunshine, CO | 230 |
| Superior town, CO | 12,483 |
| Tall Timber, CO | 208 |
| The Pinery, CO | 10,517 |
| Thornton, CO | 118,772 |
| Timnath town, CO | 625 |
| Todd Creek, CO | 3,768 |
| Trail Side, CO | 59 |
| Twin Lakes, CO | 6,101 |
| Upper Bear Creek, CO | 1,059 |
| Valmont, CO | 59 |
| Ward town, CO | 150 |
| Watkins, CO | 653 |
| Welby, CO | 14,846 |
| Weld County rural, CO | 32,898 |
| Weldona, CO | 139 |
| Wellington town, CO | 6,289 |
| West Pleasant View, CO | 3,840 |
| Westminster, CO | 106,114 |
| Wheat Ridge, CO | 30,166 |
| Wiggins town, CO | 893 |
| Windsor town, CO | 18,644 |
| | |
| Total | 3,335,576 |
