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 2021, at 34.4%. Adams County had the lowest, at 11.5%. The median was 20% and the figure for Colorado was 15.6%. Source: the U.S. Census Bureau.

Highest34.4Mineral County
Lowest11.5Adams County
Median2064 counties
Colorado15.6History

Top 40 counties, 2021

CSVChart (SVG)

Mineral CountyMineral County: 34.4 %34.4Hinsdale CountyHinsdale County: 34.2 %34.2Custer CountyCuster County: 33.9 %33.9Huerfano CountyHuerfano County: 32.7 %32.7Ouray CountyOuray County: 30.2 %30.2Sedgwick CountySedgwick County: 29.7 %29.7Archuleta CountyArchuleta County: 28.7 %28.7Delta CountyDelta County: 28.1 %28.1Costilla CountyCostilla County: 27.8 %27.8Chaffee CountyChaffee County: 27.4 %27.4Las Animas CountyLas Animas County: 26.7 %26.7Baca CountyBaca County: 25.8 %25.8Jackson CountyJackson County: 25.7 %25.7Teller CountyTeller County: 25.5 %25.5Montrose CountyMontrose County: 25.4 %25.4Saguache CountySaguache County: 24.8 %24.8Dolores CountyDolores County: 24.7 %24.7Montezuma CountyMontezuma County: 24.4 %24.4Kiowa CountyKiowa County: 24 %24San Juan CountySan Juan County: 24 %24Fremont CountyFremont County: 23.8 %23.8Rio Grande CountyRio Grande County: 23.6 %23.6Cheyenne CountyCheyenne County: 23.1 %23.1Washington CountyWashington County: 22.2 %22.2Park CountyPark County: 22.2 %22.2Clear Creek CountyClear Creek County: 21.9 %21.9Otero CountyOtero County: 21.5 %21.5Conejos CountyConejos County: 21.3 %21.3Mesa CountyMesa County: 21.2 %21.2Phillips CountyPhillips County: 21.1 %21.1La Plata CountyLa Plata County: 20.8 %20.8Pueblo CountyPueblo County: 20.1 %20.1Kit Carson CountyKit Carson County: 19.9 %19.9Gilpin CountyGilpin County: 19.8 %19.8Grand CountyGrand County: 19.5 %19.5Pitkin CountyPitkin County: 19.4 %19.4Rio Blanco CountyRio Blanco County: 19.3 %19.3Bent CountyBent County: 19.2 %19.2Logan CountyLogan County: 19.1 %19.1Elbert CountyElbert County: 18.6 %18.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2021 (%)Change on 2020
1Mineral County34.4-0.3 pts
2Hinsdale County34.2+1.1 pts
3Custer County33.9-0.3 pts
4Huerfano County32.7+0.3 pts
5Ouray County30.2+1 pts
6Sedgwick County29.7+1.3 pts
7Archuleta County28.7+0.5 pts
8Delta County28.1+0.3 pts
9Costilla County27.80 pts
10Chaffee County27.4+0.6 pts
11Las Animas County26.7+1 pts
12Baca County25.8+0.2 pts
13Jackson County25.7+1.1 pts
14Teller County25.5+1 pts
15Montrose County25.4+0.8 pts
16Saguache County24.8+0.6 pts
17Dolores County24.7+0.2 pts
18Montezuma County24.4+0.5 pts
19Kiowa County24+0.2 pts
20San Juan County24-1 pts
21Fremont County23.8+0.3 pts
22Rio Grande County23.6+0.6 pts
23Cheyenne County23.1+0.6 pts
24Washington County22.2+0.5 pts
25Park County22.2+0.6 pts
26Clear Creek County21.9+0.5 pts
27Otero County21.50 pts
28Conejos County21.3-0.1 pts
29Mesa County21.2+0.6 pts
30Phillips County21.1-0.2 pts
31La Plata County20.8+0.8 pts
32Pueblo County20.1+0.4 pts
33Kit Carson County19.9+0.8 pts
34Gilpin County19.8+1.2 pts
35Grand County19.5+0.9 pts
36Pitkin County19.4+0.7 pts
37Rio Blanco County19.3+1.3 pts
38Bent County19.2+0.7 pts
39Logan County19.1+0.4 pts
40Elbert County18.6+0.6 pts
41Yuma County18.4+0.1 pts
42Prowers County18.3+0.1 pts
43Jefferson County18.1+0.5 pts
44Lincoln County17.9+0.7 pts
45Larimer County17.8+0.6 pts
46Routt County17.6+0.8 pts
47Morgan County17.1+0.3 pts
48Moffat County17+0.5 pts
49Boulder County16.5+0.9 pts
50Alamosa County16.5+0.3 pts
51Crowley County15.4-0.2 pts
52Broomfield County15.2+0.4 pts
53Gunnison County15.1+0.3 pts
54San Miguel County15.1+0.8 pts
55Garfield County14.3+0.4 pts
56Arapahoe County14.2+0.4 pts
57El Paso County14.2+0.4 pts
58Summit County13.8+0.8 pts
59Douglas County13.6+0.5 pts
60Lake County13.3+0.6 pts
61Weld County12.8+0.3 pts
62Eagle County12.5+0.7 pts
63Denver County12.3+0.4 pts
64Adams County11.5+0.3 pts

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.

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 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 34.4% in 2021, according to the U.S. Census Bureau.

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

Adams County, with 11.5% 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, 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