| population | |
| Adams County | 519572 |
| Alamosa County | 16376 |
| Arapahoe County | 655070 |
| Archuleta County | 13359 |
| Baca County | 3506 |
| Bent County | 5650 |
| Boulder County | 330758 |
| Broomfield County | 74112 |
| Chaffee County | 19476 |
| Cheyenne County | 1748 |
| Clear Creek County | 9088 |
| Conejos County | 7461 |
| Costilla County | 3499 |
| Crowley County | 5922 |
| Custer County | 5922 |
| Delta County | 31196 |
| Denver County | 600158 |
| Dolores County | 2326 |
| Douglas County | 357978 |
| Eagle County | 55731 |
| El Paso County | 622263 |
| Elbert County | 26062 |
| population | |
| Fremont County | 48939 |
| Garfield County | 61685 |
| Gilpin County | 5808 |
| Grand County | 15717 |
| Gunnison County | 16918 |
| Hinsdale County | 788 |
| Huerfano County | 6820 |
| Jackson County | 1379 |
| Jefferson County | 582910 |
| Kiowa County | 1446 |
| Kit Carson County | 8270 |
| La Plata County | 51334 |
| Lake County | 7436 |
| Larimer County | 359066 |
| Las Animas County | 14555 |
| Lincoln County | 5675 |
| Logan County | 21528 |
| Mesa County | 155703 |
| Mineral County | 865 |
| Moffat County | 13292 |
| Montezuma County | 25849 |
| Montrose County | 42679 |
| population | |
| Morgan County | 29111 |
| Otero County | 18690 |
| Ouray County | 4874 |
| Park County | 17390 |
| Phillips County | 4530 |
| Pitkin County | 17358 |
| Prowers County | 11999 |
| Pueblo County | 168162 |
| Rio Blanco County | 6529 |
| Rio Grande County | 11982 |
| Routt County | 24829 |
| Saguache County | 6368 |
| San Juan County | 699 |
| San Miguel County | 7359 |
| Sedgwick County | 2404 |
| Summit County | 31055 |
| Teller County | 24710 |
| Washington County | 4817 |
| Weld County | 328981 |
| Yuma County | 9988 |
 | USAF Academy Airfield | ~ 58.83 km |
| Salida Airport - Harriet Alexander Field | ~ 69.98 km |
| Fremont County Airport | ~ 72.20 km |
| City of Colorado Springs Municipal Airport | ~ 72.51 km |
| Butts AAF (Fort Carson) Air Field | ~ 73.70 km |
| Lake County Airport | ~ 74.55 km |
| Centennial Airport | ~ 84.63 km |
| Buckley Space Force Base | ~ 101.14 km |
| Rocky Mountain Metropolitan Airport | ~ 106.26 km |
