Colorado Citizen Population By County in 2012 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2012, the citizen population for Colorado was 4,727,775 and represented 93.75% of the total Colorado population.

Among all Colorado counties, El Paso had the highest citizen population (600.72K), followed by Denver (537.22K), and Arapahoe (519.94K).

In terms of percentages, Hinsdale had the highest percentage of its population being citizens (100.00%), followed by Dolores (99.72%), and Mineral (99.29%).

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.

See this for other years:
Colorado Citizen Population By County in 2012
Colorado Citizen Population By County in 2012
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County Citizen Population % of County Population
El Paso 600715 96.45
Denver 537215 88.89
Arapahoe 519940 90.53
Jefferson 518325 96.69
Adams 396170 89.43
Larimer 291020 96.73
Douglas 278085 96.93
Boulder 276550 93.05
Weld 238015 93.87
Pueblo 155835 97.97
Mesa 142505 97.23
Broomfield 53635 95.92
La Plata 50660 98.47
Garfield 48995 86.98
Fremont 45475 96.75
Eagle 43855 84.58
Montrose 38740 94.50
Delta 29760 96.91
Summit 25170 90.69
Morgan 25075 88.92
Montezuma 24995 98.31
Teller 22980 99.20
Routt 22855 97.73
Elbert 22625 98.11
Logan 21450 95.16
Otero 18250 97.13
Chaffee 17550 98.15
Park 15970 98.76
Pitkin 15605 91.79
Alamosa 15120 96.00
Las Animas 15070 97.95
Gunnison 14905 96.88
Grand 14230 97.40
Moffat 12880 95.09
Archuleta 11925 98.47
Prowers 11555 92.15
Rio Grande 11485 96.31
Yuma 9030 90.03
Clear Creek 8905 98.29
Conejos 8025 97.39
Kit Carson 7530 91.72
San Miguel 6885 92.67
Huerfano 6505 96.66
Rio Blanco 6455 95.91
Lake 6410 86.97
Bent 5980 96.61
Saguache 5660 91.44
Crowley 5450 94.87
Gilpin 5300 98.88
Lincoln 5160 94.77
Washington 4715 98.33
Ouray 4380 98.54
Custer 4175 99.17
Phillips 4010 91.55
Baca 3715 98.15
Costilla 3250 91.42
Sedgwick 2320 97.07
Cheyenne 1950 93.08
Dolores 1800 99.72
Jackson 1375 98.57
Kiowa 1360 97.49
Hinsdale 790 100.00
San Juan 730 97.99
Mineral 695 99.29