Colorado Citizen Population By County in 2019 (ACS-5Yrs)

Updated on March 28, 2026.

Based on the US Census Bureau's special tabulation from the ACS 5-year estimates, in 2019, the citizen population for Colorado was 5,298,855 and represented 94.45% of the total Colorado population.

Among all Colorado counties, El Paso had the highest citizen population (676.77K), followed by Denver (640.80K), and Arapahoe (590.28K).

In terms of percentages, Hinsdale had the highest percentage of its population being citizens (100.00%), followed by Mineral (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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Colorado Citizen Population By County in 2019
Colorado Citizen Population By County in 2019
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County Citizen Population % of County Population
El Paso 676765 96.82
Denver 640805 90.82
Arapahoe 590275 91.58
Jefferson 557985 97.08
Adams 455435 90.34
Larimer 334155 96.92
Douglas 324530 96.58
Boulder 302760 93.88
Weld 288195 94.38
Pueblo 163350 98.42
Mesa 147735 97.70
Broomfield 65405 96.35
La Plata 54915 98.74
Garfield 52660 89.17
Eagle 47855 87.52
Fremont 46675 98.64
Montrose 39990 95.93
Delta 29895 97.81
Summit 28045 91.50
Morgan 25595 89.76
Montezuma 25565 98.21
Elbert 25350 98.58
Routt 24410 97.37
Teller 24245 98.86
Logan 21560 96.34
Chaffee 19225 98.31
Park 17685 98.99
Otero 17655 96.58
Pitkin 16540 92.27
Gunnison 16465 98.01
Alamosa 15275 94.85
Grand 14835 96.93
Las Animas 13750 96.39
Archuleta 12985 97.96
Moffat 12585 95.89
Prowers 11205 93.22
Rio Grande 10890 96.33
Clear Creek 9365 98.63
Yuma 8875 88.71
Conejos 8055 99.08
San Miguel 7560 93.91
Lake 7160 92.39
Kit Carson 7005 94.09
Huerfano 6590 98.65
Rio Blanco 6245 97.81
Saguache 6195 94.01
Gilpin 5870 97.51
Bent 5585 96.54
Crowley 5580 96.96
Lincoln 5365 96.06
Washington 4785 98.26
Custer 4755 99.58
Ouray 4755 99.17
Phillips 3845 89.63
Costilla 3545 94.66
Baca 3480 97.75
Sedgwick 2275 98.06
Cheyenne 1895 93.58
Dolores 1845 99.46
Kiowa 1485 99.66
Jackson 1235 98.02
Hinsdale 855 100.00
Mineral 825 100.00
San Juan 590 100.00