Data / Rankings / Population density / Counties in Colorado

Counties in Colorado by population density

Denver County had the highest population density of 64 counties in 2021, at 1,796.3 inhabitants per km². Hinsdale County had the lowest, at 0.3 inhabitants per km². The median was 4.3 inhabitants per km² and the figure for Colorado was 21.7 inhabitants per km². Source: the U.S. Census Bureau.

Highest1,796.3Denver County
Lowest0.3Hinsdale County
Median4.364 counties
Colorado21.7History

Top 40 counties, 2021

CSVChart (SVG)

Denver CountyDenver County: 1,796.3 inhabitants per km²1,796.3Broomfield CountyBroomfield County: 883.2 inhabitants per km²883.2Arapahoe CountyArapahoe County: 317.9 inhabitants per km²317.9Jefferson CountyJefferson County: 293.5 inhabitants per km²293.5Boulder CountyBoulder County: 174 inhabitants per km²174Adams CountyAdams County: 173.1 inhabitants per km²173.1Douglas CountyDouglas County: 170 inhabitants per km²170El Paso CountyEl Paso County: 134.1 inhabitants per km²134.1Larimer CountyLarimer County: 54 inhabitants per km²54Weld CountyWeld County: 32.9 inhabitants per km²32.9Pueblo CountyPueblo County: 27.4 inhabitants per km²27.4Summit CountySummit County: 19.8 inhabitants per km²19.8Mesa CountyMesa County: 18.3 inhabitants per km²18.3Teller CountyTeller County: 17.3 inhabitants per km²17.3Gilpin CountyGilpin County: 15.2 inhabitants per km²15.2La Plata CountyLa Plata County: 12.8 inhabitants per km²12.8Eagle CountyEagle County: 12.8 inhabitants per km²12.8Fremont CountyFremont County: 12.4 inhabitants per km²12.4Delta CountyDelta County: 10.6 inhabitants per km²10.6Clear Creek CountyClear Creek County: 9.2 inhabitants per km²9.2Alamosa CountyAlamosa County: 8.9 inhabitants per km²8.9Morgan CountyMorgan County: 8.8 inhabitants per km²8.8Garfield CountyGarfield County: 8.1 inhabitants per km²8.1Lake CountyLake County: 7.6 inhabitants per km²7.6Chaffee CountyChaffee County: 7.5 inhabitants per km²7.5Montrose CountyMontrose County: 7.5 inhabitants per km²7.5Pitkin CountyPitkin County: 6.9 inhabitants per km²6.9Elbert CountyElbert County: 5.7 inhabitants per km²5.7Otero CountyOtero County: 5.7 inhabitants per km²5.7Montezuma CountyMontezuma County: 5 inhabitants per km²5Rio Grande CountyRio Grande County: 4.8 inhabitants per km²4.8Logan CountyLogan County: 4.4 inhabitants per km²4.4Routt CountyRoutt County: 4.1 inhabitants per km²4.1Archuleta CountyArchuleta County: 3.9 inhabitants per km²3.9Ouray CountyOuray County: 3.6 inhabitants per km²3.6Grand CountyGrand County: 3.3 inhabitants per km²3.3Park CountyPark County: 3.1 inhabitants per km²3.1Crowley CountyCrowley County: 2.8 inhabitants per km²2.8Prowers CountyProwers County: 2.8 inhabitants per km²2.8Custer CountyCuster County: 2.7 inhabitants per km²2.7
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2021
inhabitants per km²		Change on 2020
1Denver County1,796.3-0.8%
2Broomfield County883.2+1.2%
3Arapahoe County317.9+0.3%
4Jefferson County293.5-0.4%
5Boulder County174-1.1%
6Adams County173.1+0.5%
7Douglas County170+2.6%
8El Paso County134.1+0.6%
9Larimer County54+0.8%
10Weld County32.9+2.6%
11Pueblo County27.4+0.6%
12Summit County19.80%
13Mesa County18.3+1%
14Teller County17.3+0.8%
15Gilpin County15.2+1.3%
16La Plata County12.8+0.9%
17Eagle County12.8+0.2%
18Fremont County12.4+0.7%
19Delta County10.6+1.1%
20Clear Creek County9.2+0.5%
21Alamosa County8.9+1.3%
22Morgan County8.8-0.2%
23Garfield County8.1+0.5%
24Lake County7.6-0.1%
25Chaffee County7.5+1.3%
26Montrose County7.5+1%
27Pitkin County6.9-0%
28Elbert County5.7+3.6%
29Otero County5.7-0.8%
30Montezuma County5+1.4%
31Rio Grande County4.8-1.2%
32Logan County4.4-1%
33Routt County4.1+1%
34Archuleta County3.9+2.8%
35Ouray County3.6+3.7%
36Grand County3.3+0.7%
37Park County3.1+2%
38Crowley County2.8+0.9%
39Prowers County2.8-0.6%
40Custer County2.7+7.3%
41Phillips County2.5-0.5%
42San Miguel County2.4+0.4%
43Conejos County2.3+1.8%
44Gunnison County2.1+2%
45Huerfano County1.7+1.7%
46Sedgwick County1.6-2.7%
47Yuma County1.6-0.4%
48Bent County1.4-2.5%
49Kit Carson County1.2-1.9%
50Las Animas County1.2-1%
51Costilla County1.1+3%
52Moffat County1.1-0.8%
53Dolores County0.9+1.9%
54Lincoln County0.8-3.5%
55Saguache County0.8+2.1%
56Rio Blanco County0.8-1.3%
57Washington County0.7+1.1%
58San Juan County0.7+4.1%
59Baca County0.5+0.4%
60Mineral County0.4+5.7%
61Cheyenne County0.4-1.6%
62Jackson County0.3-1.5%
63Kiowa County0.30%
64Hinsdale County0.3-2.2%

Other periods

About this ranking

Resident population divided by land area in km². World Bank figures use mid-year population and land area excluding inland water.

United States: Census Bureau population estimates for 1 July divided by land area (water excluded) from the latest Census Gazetteer files. US tables often give people per square mile; multiply persons per km² by 2.59 to compare.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. Equal values share a rank.

How to cite

U.S. Census Bureau. Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/. Retrieved 2026-10-09.

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Questions

Which county has the highest population density?

Denver County, with 1,796.3 inhabitants per km² in 2021, according to the U.S. Census Bureau.

Which county has the lowest population density?

Hinsdale County, with 0.3 inhabitants per km² in 2021.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, Population Estimates Program resident population on 1 July divided by land area from the latest Census Gazetteer files, persons per km². Retrieved 2026-10-09.

Population density: other rankings

Counties in Colorado: more rankings