Colorado Population By County in 2021 (ACS-5Yrs)
Updated on February 28, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, the total population of Colorado was 5.72M. Among all Colorado counties, El Paso was the most populated county (722.74K), followed by Denver (706.80K), and then Arapahoe (651.62K).
On the other hand, the least populated counties were: San Juan (698), Mineral (794), and Hinsdale (858).
The chart and table below shows the population of each county and the percentage of Colorado population in each county.
You can see similar information for other states and by state for the United States.
Related Topics: Colorado ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census - ACS 5-Year Estimates, 2021 Census.
Colorado Population By County in 2021
Colorado Population By County in 2021
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| County | Population | % of State Population |
|---|---|---|
| Adams | 514969 | 9.00 |
| Alamosa | 16377 | 0.29 |
| Arapahoe | 651621 | 11.39 |
| Archuleta | 13267 | 0.23 |
| Baca | 3519 | 0.06 |
| Bent | 5861 | 0.10 |
| Boulder | 328713 | 5.74 |
| Broomfield | 72697 | 1.27 |
| Chaffee | 19436 | 0.34 |
| Cheyenne | 1691 | 0.03 |
| Clear Creek | 9427 | 0.17 |
| Conejos | 7579 | 0.13 |
| Costilla | 3517 | 0.06 |
| Crowley | 6018 | 0.11 |
| Custer | 4720 | 0.08 |
| Delta | 31133 | 0.54 |
| Denver | 706799 | 12.35 |
| Dolores | 2288 | 0.04 |
| Douglas | 351929 | 6.15 |
| Eagle | 55693 | 0.97 |
| Elbert | 25897 | 0.45 |
| El Paso | 722736 | 12.63 |
| Fremont | 49007 | 0.86 |
| Garfield | 61221 | 1.07 |
| Gilpin | 5812 | 0.10 |
| Grand | 15629 | 0.27 |
| Gunnison | 16851 | 0.29 |
| Hinsdale | 858 | 0.02 |
| Huerfano | 6787 | 0.12 |
| Jackson | 1375 | 0.02 |
| Jefferson | 580130 | 10.14 |
| Kiowa | 1414 | 0.03 |
| Kit Carson | 7071 | 0.12 |
| Lake | 7417 | 0.13 |
| La Plata | 55673 | 0.97 |
| Larimer | 354670 | 6.20 |
| Las Animas | 14531 | 0.25 |
| Lincoln | 5630 | 0.10 |
| Logan | 21765 | 0.38 |
| Mesa | 154685 | 2.70 |
| Mineral | 794 | 0.01 |
| Moffat | 13240 | 0.23 |
| Montezuma | 25916 | 0.45 |
| Montrose | 42328 | 0.74 |
| Morgan | 28868 | 0.50 |
| Otero | 18665 | 0.33 |
| Ouray | 4850 | 0.09 |
| Park | 17384 | 0.30 |
| Phillips | 4497 | 0.08 |
| Pitkin | 17471 | 0.31 |
| Prowers | 11966 | 0.21 |
| Pueblo | 167453 | 2.93 |
| Rio Blanco | 6495 | 0.11 |
| Rio Grande | 11476 | 0.20 |
| Routt | 24899 | 0.44 |
| Saguache | 6369 | 0.11 |
| San Juan | 698 | 0.01 |
| San Miguel | 8084 | 0.14 |
| Sedgwick | 2459 | 0.04 |
| Summit | 31042 | 0.54 |
| Teller | 24607 | 0.43 |
| Washington | 4834 | 0.08 |
| Weld | 322424 | 5.63 |
| Yuma | 9944 | 0.17 |
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