The graph below ranks each Colorado County by total residents according to the 2006 census estimates.
Colorado total population by county
| County | Total Population |
| El Paso |  576,884 |
| Denver | 566,974 |
| Arapahoe | 537,197 |
| Jefferson | 526,994 |
| Adams | 414,338 |
| Boulder | 282,304 |
| Larimer | 276,253 |
| Douglas | 263,621 |
| Weld | 236,857 |
| Pueblo | 152,912 |
| Mesa | 134,189 |
| Garfield | 51,908 |
| Eagle | 49,085 |
| Fremont | 48,010 |
| La Plata | 47,936 |
| Broomfield | 45,116 |
| Montrose | 38,559 |
| Delta | 30,401 |
| Morgan | 28,109 |
| Summit | 25,399 |
| Montezuma | 25,217 |
| Elbert | 23,181 |
| Teller | 22,243 |
| Routt | 21,580 |
| Logan | 20,780 |
| Otero | 19,452 |
| Park | 17,157 |
| Chaffee | 16,918 |
| Las Animas | 15,564 |
| Alamosa | 15,225 |
| Pitkin | 14,798 |
| Gunnison | 14,331 |
| Prowers | 13,776 |
| Moffat | 13,680 |
| Grand | 13,406 |
| Archuleta | 12,386 |
| Rio Grande | 12,006 |
| Yuma | 9,829 |
| Clear Creek | 9,130 |
| Conejos | 8,406 |
| Lake | 7,814 |
| Huerfano | 7,808 |
| Kit Carson | 7,590 |
| San Miguel | 7,143 |
| Saguache | 7,006 |
| Rio Blanco | 6,180 |
| Bent | 5,551 |
| Lincoln | 5,458 |
| Crowley | 5,386 |
| Gilpin | 5,042 |
| Washington | 4,630 |
| Phillips | 4,601 |
| Ouray | 4,307 |
| Baca | 4,017 |
| Custer | 3,926 |
| Costilla | 3,378 |
| Sedgwick | 2,467 |
| Dolores | 1,911 |
| Cheyenne | 1,906 |
| Kiowa | 1,413 |
| Jackson | 1,406 |
| Mineral | 929 |
| Hinsdale | 819 |
| San Juan | 578 |