Data / Rankings / Population aged 65 and over / Counties in Colorado

Counties in Colorado by share of population aged 65 and over

Mineral County had the highest share of population aged 65 and over of 64 counties in 2020, at 34.7%. Adams County had the lowest, at 11.2%. The median was 19.4% and the figure for Colorado was 15.1%. Source: the U.S. Census Bureau.

Highest34.7Mineral County
Lowest11.2Adams County
Median19.464 counties
Colorado15.1History

Top 40 counties, 2020

CSVChart (SVG)

Mineral CountyMineral County: 34.7 %34.7Custer CountyCuster County: 34.3 %34.3Hinsdale CountyHinsdale County: 33.1 %33.1Huerfano CountyHuerfano County: 32.4 %32.4Ouray CountyOuray County: 29.1 %29.1Sedgwick CountySedgwick County: 28.4 %28.4Archuleta CountyArchuleta County: 28.2 %28.2Costilla CountyCostilla County: 27.8 %27.8Delta CountyDelta County: 27.8 %27.8Chaffee CountyChaffee County: 26.8 %26.8Las Animas CountyLas Animas County: 25.7 %25.7Baca CountyBaca County: 25.6 %25.6San Juan CountySan Juan County: 24.9 %24.9Montrose CountyMontrose County: 24.7 %24.7Jackson CountyJackson County: 24.6 %24.6Dolores CountyDolores County: 24.5 %24.5Teller CountyTeller County: 24.5 %24.5Saguache CountySaguache County: 24.3 %24.3Montezuma CountyMontezuma County: 23.9 %23.9Kiowa CountyKiowa County: 23.8 %23.8Fremont CountyFremont County: 23.5 %23.5Rio Grande CountyRio Grande County: 23 %23Cheyenne CountyCheyenne County: 22.5 %22.5Washington CountyWashington County: 21.8 %21.8Park CountyPark County: 21.6 %21.6Otero CountyOtero County: 21.5 %21.5Conejos CountyConejos County: 21.4 %21.4Clear Creek CountyClear Creek County: 21.4 %21.4Phillips CountyPhillips County: 21.4 %21.4Mesa CountyMesa County: 20.7 %20.7La Plata CountyLa Plata County: 19.9 %19.9Pueblo CountyPueblo County: 19.7 %19.7Kit Carson CountyKit Carson County: 19.1 %19.1Logan CountyLogan County: 18.7 %18.7Pitkin CountyPitkin County: 18.7 %18.7Gilpin CountyGilpin County: 18.6 %18.6Grand CountyGrand County: 18.5 %18.5Bent CountyBent County: 18.5 %18.5Yuma CountyYuma County: 18.3 %18.3Prowers CountyProwers County: 18.2 %18.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2020 (%)
1Mineral County34.7
2Custer County34.3
3Hinsdale County33.1
4Huerfano County32.4
5Ouray County29.1
6Sedgwick County28.4
7Archuleta County28.2
8Costilla County27.8
9Delta County27.8
10Chaffee County26.8
11Las Animas County25.7
12Baca County25.6
13San Juan County24.9
14Montrose County24.7
15Jackson County24.6
16Dolores County24.5
17Teller County24.5
18Saguache County24.3
19Montezuma County23.9
20Kiowa County23.8
21Fremont County23.5
22Rio Grande County23
23Cheyenne County22.5
24Washington County21.8
25Park County21.6
26Otero County21.5
27Conejos County21.4
28Clear Creek County21.4
29Phillips County21.4
30Mesa County20.7
31La Plata County19.9
32Pueblo County19.7
33Kit Carson County19.1
34Logan County18.7
35Pitkin County18.7
36Gilpin County18.6
37Grand County18.5
38Bent County18.5
39Yuma County18.3
40Prowers County18.2
41Elbert County18
42Rio Blanco County18
43Jefferson County17.5
44Larimer County17.2
45Lincoln County17.2
46Routt County16.8
47Morgan County16.8
48Moffat County16.5
49Alamosa County16.2
50Boulder County15.6
51Crowley County15.6
52Gunnison County14.9
53Broomfield County14.8
54San Miguel County14.3
55Garfield County13.8
56Arapahoe County13.8
57El Paso County13.8
58Douglas County13.1
59Summit County13
60Lake County12.7
61Weld County12.6
62Denver County11.9
63Eagle County11.8
64Adams County11.2

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

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, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

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Rank Counties in Colorado by share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"Colorado","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_share&level=province&within=Colorado&limit=10

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Questions

Which county has the highest share of population aged 65 and over?

Mineral County, with 34.7% in 2020, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Adams County, with 11.2% 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, county population by age and sex (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in Colorado: more rankings