Data / Rankings / Population density / Counties in Colorado

Counties in Colorado by population density

Denver County had the highest population density of 64 counties in 2020, at 1,810.2 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 21.6 inhabitants per km². Source: the U.S. Census Bureau.

Highest1,810.2Denver County
Lowest0.3Hinsdale County
Median4.364 counties
Colorado21.6History

Top 40 counties, 2020

CSVChart (SVG)

Denver CountyDenver County: 1,810.2 inhabitants per km²1,810.2Broomfield CountyBroomfield County: 872.3 inhabitants per km²872.3Arapahoe CountyArapahoe County: 317.1 inhabitants per km²317.1Jefferson CountyJefferson County: 294.5 inhabitants per km²294.5Boulder CountyBoulder County: 175.9 inhabitants per km²175.9Adams CountyAdams County: 172.2 inhabitants per km²172.2Douglas CountyDouglas County: 165.6 inhabitants per km²165.6El Paso CountyEl Paso County: 133.2 inhabitants per km²133.2Larimer CountyLarimer County: 53.5 inhabitants per km²53.5Weld CountyWeld County: 32.1 inhabitants per km²32.1Pueblo CountyPueblo County: 27.2 inhabitants per km²27.2Summit CountySummit County: 19.8 inhabitants per km²19.8Mesa CountyMesa County: 18.1 inhabitants per km²18.1Teller CountyTeller County: 17.1 inhabitants per km²17.1Gilpin CountyGilpin County: 15 inhabitants per km²15Eagle CountyEagle County: 12.8 inhabitants per km²12.8La Plata CountyLa Plata County: 12.7 inhabitants per km²12.7Fremont CountyFremont County: 12.3 inhabitants per km²12.3Delta CountyDelta County: 10.5 inhabitants per km²10.5Clear Creek CountyClear Creek County: 9.1 inhabitants per km²9.1Morgan CountyMorgan County: 8.8 inhabitants per km²8.8Alamosa CountyAlamosa 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: 7.4 inhabitants per km²7.4Montrose CountyMontrose County: 7.4 inhabitants per km²7.4Pitkin CountyPitkin County: 6.9 inhabitants per km²6.9Otero CountyOtero County: 5.7 inhabitants per km²5.7Elbert CountyElbert County: 5.5 inhabitants per km²5.5Montezuma CountyMontezuma County: 4.9 inhabitants per km²4.9Rio Grande CountyRio Grande County: 4.9 inhabitants per km²4.9Logan CountyLogan County: 4.5 inhabitants per km²4.5Routt CountyRoutt County: 4.1 inhabitants per km²4.1Archuleta CountyArchuleta County: 3.8 inhabitants per km²3.8Ouray CountyOuray County: 3.5 inhabitants per km²3.5Grand CountyGrand County: 3.3 inhabitants per km²3.3Park CountyPark County: 3.1 inhabitants per km²3.1Prowers CountyProwers County: 2.8 inhabitants per km²2.8Crowley CountyCrowley County: 2.8 inhabitants per km²2.8Phillips CountyPhillips County: 2.5 inhabitants per km²2.5
inhabitants per km². Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2020
inhabitants per km²
1Denver County1,810.2
2Broomfield County872.3
3Arapahoe County317.1
4Jefferson County294.5
5Boulder County175.9
6Adams County172.2
7Douglas County165.6
8El Paso County133.2
9Larimer County53.5
10Weld County32.1
11Pueblo County27.2
12Summit County19.8
13Mesa County18.1
14Teller County17.1
15Gilpin County15
16Eagle County12.8
17La Plata County12.7
18Fremont County12.3
19Delta County10.5
20Clear Creek County9.1
21Morgan County8.8
22Alamosa County8.8
23Garfield County8.1
24Lake County7.6
25Chaffee County7.4
26Montrose County7.4
27Pitkin County6.9
28Otero County5.7
29Elbert County5.5
30Montezuma County4.9
31Rio Grande County4.9
32Logan County4.5
33Routt County4.1
34Archuleta County3.8
35Ouray County3.5
36Grand County3.3
37Park County3.1
38Prowers County2.8
39Crowley County2.8
40Phillips County2.5
41Custer County2.5
42San Miguel County2.4
43Conejos County2.2
44Gunnison County2
45Sedgwick County1.7
46Huerfano County1.7
47Yuma County1.6
48Bent County1.4
49Kit Carson County1.3
50Las Animas County1.2
51Costilla County1.1
52Moffat County1.1
53Lincoln County0.8
54Dolores County0.8
55Rio Blanco County0.8
56Saguache County0.8
57Washington County0.7
58San Juan County0.7
59Baca County0.5
60Mineral County0.4
61Cheyenne County0.4
62Jackson County0.3
63Kiowa County0.3
64Hinsdale County0.3

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.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in Colorado by population density using official data, and cite the source.
rank_places {"indicator":"population_density","level":"province","within":"Colorado","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_density&level=province&within=Colorado&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population density?

Denver County, with 1,810.2 inhabitants per km² in 2020, according to the U.S. Census Bureau.

Which county has the lowest population density?

Hinsdale County, with 0.3 inhabitants per km² in 2020.

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