Colorado Citizen Population By County in 2010 (ACS-5Yrs)
Updated on March 28, 2026.
Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2010, the citizen population for Colorado was 4,565,960 and represented 93.43% of the total Colorado population.
Among all Colorado counties, El Paso had the highest citizen population (576.76K), followed by Jefferson (510.08K), and Denver (509.02K).
In terms of percentages, Dolores had the highest percentage of its population being citizens (100.00%), followed by Hinsdale (100.00%), and San Juan (100.00%).
The chart and table below shows the citizen population of each county and the percentage of each county's population that were citizens.
You can see similar information for other states and by state for the United States.
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Data Source: US Census - ACS 5-Year (CVAP).
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Colorado Citizen Population By County in 2010
Colorado Citizen Population By County in 2010
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| County | Citizen Population | % of County Population |
|---|---|---|
| El Paso | 576755 | 96.13 |
| Jefferson | 510080 | 96.49 |
| Denver | 509020 | 88.05 |
| Arapahoe | 498535 | 90.17 |
| Adams | 378380 | 88.96 |
| Larimer | 281475 | 96.67 |
| Boulder | 268500 | 92.53 |
| Douglas | 265655 | 97.15 |
| Weld | 226335 | 93.20 |
| Pueblo | 152985 | 97.91 |
| Mesa | 138270 | 97.18 |
| Broomfield | 50940 | 96.35 |
| La Plata | 49225 | 98.16 |
| Garfield | 47010 | 85.85 |
| Fremont | 45100 | 96.08 |
| Eagle | 42460 | 83.59 |
| Montrose | 37865 | 94.04 |
| Delta | 29445 | 96.43 |
| Montezuma | 24870 | 98.38 |
| Morgan | 24750 | 88.68 |
| Summit | 24535 | 90.52 |
| Teller | 22590 | 98.99 |
| Elbert | 22510 | 99.12 |
| Routt | 22290 | 97.23 |
| Logan | 21435 | 96.21 |
| Otero | 18325 | 97.32 |
| Chaffee | 17235 | 98.26 |
| Park | 15900 | 97.64 |
| Las Animas | 15340 | 97.86 |
| Pitkin | 14790 | 90.24 |
| Alamosa | 14610 | 95.52 |
| Gunnison | 14495 | 95.77 |
| Grand | 14040 | 96.66 |
| Moffat | 12880 | 95.27 |
| Archuleta | 12090 | 99.63 |
| Prowers | 11865 | 93.17 |
| Rio Grande | 11445 | 95.98 |
| Clear Creek | 8920 | 98.13 |
| Yuma | 8865 | 89.59 |
| Conejos | 7945 | 96.66 |
| Kit Carson | 7420 | 90.99 |
| San Miguel | 6825 | 93.49 |
| Huerfano | 6710 | 96.55 |
| Lake | 6140 | 87.22 |
| Rio Blanco | 6120 | 94.23 |
| Bent | 5855 | 95.59 |
| Crowley | 5565 | 94.40 |
| Saguache | 5560 | 90.26 |
| Lincoln | 5275 | 96.35 |
| Gilpin | 5010 | 97.76 |
| Washington | 4610 | 96.55 |
| Ouray | 4260 | 98.61 |
| Phillips | 4115 | 93.63 |
| Custer | 3870 | 99.23 |
| Baca | 3795 | 98.96 |
| Costilla | 3270 | 92.50 |
| Sedgwick | 2360 | 97.93 |
| Cheyenne | 2105 | 95.90 |
| Dolores | 2025 | 100.00 |
| Kiowa | 1635 | 99.39 |
| Jackson | 1450 | 98.98 |
| Mineral | 1005 | 98.53 |
| San Juan | 750 | 100.00 |
| Hinsdale | 490 | 100.00 |
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