Colorado Population By County in 2018
Updated on June 22, 2021.

According to the US Census Bureau population estimates, there were 5,691,287 people living in Colorado in 2018. Denver County was the most populated county with 716,265 residents, followed by El Paso County with 712,089 residents, and Arapahoe County with 651,797 residents. San Juan County with a population of 764 was the least populated county in Colorado in 2018.

Use the map below to interactively explore the population of each county in Colorado in 2018. The data can also be explored further by sorting and filtering with the table below.

Hover/Click on the counties to see the values.
Colorado Population By County (2018)
See also Population estimate for other years:
Table of Colorado Population By County in 2018
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County Population % of State Population
Adams 511,354 8.99%
Alamosa 16,248 0.28%
Arapahoe 651,797 11.45%
Archuleta 13,730 0.24%
Baca 3,584 0.06%
Bent 5,808 0.10%
Boulder 324,636 5.70%
Broomfield 69,324 1.22%
Chaffee 20,041 0.35%
Cheyenne 1,859 0.03%
Clear Creek 9,604 0.17%
Conejos 8,181 0.14%
Costilla 3,812 0.07%
Crowley 5,957 0.11%
Custer 4,934 0.09%
Delta 30,884 0.54%
Denver 716,265 12.59%
Dolores 2,060 0.04%
Douglas 342,989 6.03%
Eagle 54,943 0.97%
Elbert 26,303 0.46%
El Paso 712,089 12.51%
Fremont 47,959 0.84%
Garfield 59,701 1.05%
Gilpin 6,112 0.11%
Grand 15,511 0.27%
Gunnison 17,167 0.30%
Hinsdale 808 0.01%
Huerfano 6,887 0.12%
Jackson 1,395 0.03%
Jefferson 579,392 10.18%
Kiowa 1,379 0.02%
Kit Carson 7,159 0.13%
Lake 7,846 0.14%
La Plata 56,299 0.99%
Larimer 350,660 6.16%
Las Animas 14,508 0.26%
Lincoln 5,606 0.10%
Logan 22,268 0.39%
Mesa 152,951 2.69%
Mineral 772 0.01%
Moffat 13,183 0.23%
Montezuma 26,152 0.46%
Montrose 42,206 0.74%
Morgan 28,769 0.51%
Otero 18,338 0.32%
Ouray 4,822 0.09%
Park 18,525 0.33%
Phillips 4,285 0.08%
Pitkin 17,976 0.32%
Prowers 12,079 0.21%
Pueblo 167,422 2.94%
Rio Blanco 6,330 0.11%
Rio Grande 11,271 0.20%
Routt 25,507 0.45%
Saguache 6,840 0.12%
San Juan 764 0.01%
San Miguel 8,180 0.14%
Sedgwick 2,276 0.04%
Summit 30,817 0.54%
Teller 25,113 0.44%
Washington 4,888 0.09%
Weld 314,815 5.53%
Yuma 9,947 0.18%