The graph below ranks each Colorado County by total residents according to the 2012 census estimates.
Colorado total population by county
| County | Total Population |
| El Paso |  645,439 |
| Denver | 634,542 |
| Arapahoe | 595,850 |
| Jefferson | 545,476 |
| Adams | 460,057 |
| Larimer | 310,686 |
| Boulder | 305,297 |
| Douglas | 298,417 |
| Weld | 263,525 |
| Pueblo | 160,972 |
| Mesa | 147,790 |
| Broomfield | 58,311 |
| Garfield | 56,901 |
| La Plata | 52,419 |
| Eagle | 51,921 |
| Fremont | 46,760 |
| Montrose | 40,748 |
| Delta | 30,422 |
| Morgan | 28,374 |
| Summit | 28,151 |
| Montezuma | 25,432 |
| Elbert | 23,415 |
| Teller | 23,379 |
| Routt | 23,247 |
| Logan | 22,603 |
| Otero | 18,790 |
| Chaffee | 18,127 |
| Pitkin | 17,217 |
| Alamosa | 16,123 |
| Park | 16,069 |
| Gunnison | 15,439 |
| Las Animas | 14,995 |
| Grand | 14,162 |
| Moffat | 13,190 |
| Prowers | 12,416 |
| Archuleta | 12,103 |
| Rio Grande | 11,939 |
| Yuma | 10,113 |
| Clear Creek | 9,060 |
| Conejos | 8,275 |
| Kit Carson | 8,103 |
| San Miguel | 7,588 |
| Lake | 7,283 |
| Rio Blanco | 6,808 |
| Huerfano | 6,605 |
| Saguache | 6,318 |
| Bent | 5,780 |
| Gilpin | 5,497 |
| Lincoln | 5,449 |
| Crowley | 5,376 |
| Washington | 4,753 |
| Ouray | 4,532 |
| Phillips | 4,374 |
| Custer | 4,245 |
| Baca | 3,761 |
| Costilla | 3,593 |
| Sedgwick | 2,381 |
| Dolores | 1,995 |
| Cheyenne | 1,881 |
| Kiowa | 1,439 |
| Jackson | 1,346 |
| Hinsdale | 809 |
| Mineral | 705 |
| San Juan | 685 |