Data / Rankings / Population aged 18 to 64 / Counties in Colorado

Counties in Colorado by population aged 18 to 64

Crowley County had the highest population aged 18 to 64 of 64 counties in 2023, at 72.4%. Hinsdale County had the lowest, at 47.1%. The median was 58.5% and the figure for Colorado was 62.9%. Source: the U.S. Census Bureau.

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Highest72.4Crowley County
Lowest47.1Hinsdale County
Median58.564 counties
Colorado62.9History

Map of counties, 2023

Adams County: 64.1 %Alamosa County: 59.1 %Arapahoe County: 62.6 %Archuleta County: 52.5 %Baca County: 51.9 %Bent County: 64.9 %Boulder County: 65.1 %Broomfield County: 64 %Chaffee County: 57.7 %Cheyenne County: 52.2 %Clear Creek County: 62.9 %Conejos County: 51.3 %Costilla County: 52.3 %Crowley County: 72.4 %Custer County: 50.6 %Delta County: 51.7 %Denver County: 69.3 %Dolores County: 59.4 %Douglas County: 61.8 %Eagle County: 65.9 %Elbert County: 58.5 %El Paso County: 62.3 %Fremont County: 60.2 %Garfield County: 61.4 %Gilpin County: 65.3 %Grand County: 63.6 %Gunnison County: 67.9 %Hinsdale County: 47.1 %Huerfano County: 51.5 %Jackson County: 53.6 %Jefferson County: 62.9 %Kiowa County: 50.5 %Kit Carson County: 54.3 %Lake County: 64.7 %La Plata County: 60.1 %Larimer County: 63.1 %Las Animas County: 55.8 %Lincoln County: 60.3 %Logan County: 60.4 %Mesa County: 57.6 %Mineral County: 53.7 %Moffat County: 58.6 %Montezuma County: 54 %Montrose County: 53.6 %Morgan County: 56.4 %Otero County: 54.5 %Ouray County: 54.4 %Park County: 61.2 %Phillips County: 53.9 %Pitkin County: 62.8 %Prowers County: 55.5 %Pueblo County: 57.5 %Rio Blanco County: 55.7 %Rio Grande County: 54.9 %Routt County: 62.5 %Saguache County: 54.7 %San Juan County: 65.2 %San Miguel County: 65.7 %Sedgwick County: 49.8 %Summit County: 69.2 %Teller County: 56.6 %Washington County: 53.2 %Weld County: 61.1 %Yuma County: 53.2 %
  • Under 53
  • 53 to 55
  • 55 to 59
  • 59 to 62
  • 62 to 64
  • 64 and over
%, 2023. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2023

Crowley County: 72.4 %Crowley County72.4Denver County: 69.3 %Denver County69.3Summit County: 69.2 %Summit County69.2Gunnison County: 67.9 %Gunnison County67.9Eagle County: 65.9 %Eagle County65.9San Miguel County: 65.7 %San Miguel County65.7Gilpin County: 65.3 %Gilpin County65.3San Juan County: 65.2 %San Juan County65.2Boulder County: 65.1 %Boulder County65.1Bent County: 64.9 %Bent County64.9Lake County: 64.7 %Lake County64.7Adams County: 64.1 %Adams County64.1Broomfield County: 64 %Broomfield County64Grand County: 63.6 %Grand County63.6Larimer County: 63.1 %Larimer County63.1Clear Creek County: 62.9 %Clear Creek County62.9Jefferson County: 62.9 %Jefferson County62.9Pitkin County: 62.8 %Pitkin County62.8Arapahoe County: 62.6 %Arapahoe County62.6Routt County: 62.5 %Routt County62.5El Paso County: 62.3 %El Paso County62.3Douglas County: 61.8 %Douglas County61.8Garfield County: 61.4 %Garfield County61.4Park County: 61.2 %Park County61.2Weld County: 61.1 %Weld County61.1Logan County: 60.4 %Logan County60.4Lincoln County: 60.3 %Lincoln County60.3Fremont County: 60.2 %Fremont County60.2La Plata County: 60.1 %La Plata County60.1Dolores County: 59.4 %Dolores County59.4Alamosa County: 59.1 %Alamosa County59.1Moffat County: 58.6 %Moffat County58.6Elbert County: 58.5 %Elbert County58.5Chaffee County: 57.7 %Chaffee County57.7Mesa County: 57.6 %Mesa County57.6Pueblo County: 57.5 %Pueblo County57.5Teller County: 56.6 %Teller County56.6Morgan County: 56.4 %Morgan County56.4Las Animas County: 55.8 %Las Animas County55.8Rio Blanco County: 55.7 %Rio Blanco County55.7Crowley County: 72.4 %Crowley County72.4Denver County: 69.3 %Denver County69.3Summit County: 69.2 %Summit County69.2Gunnison County: 67.9 %Gunnison County67.9Eagle County: 65.9 %Eagle County65.9San Miguel County: 65.7 %San Miguel County65.7Gilpin County: 65.3 %Gilpin County65.3San Juan County: 65.2 %San Juan County65.2Boulder County: 65.1 %Boulder County65.1Bent County: 64.9 %Bent County64.9Lake County: 64.7 %Lake County64.7Adams County: 64.1 %Adams County64.1Broomfield County: 64 %Broomfield County64Grand County: 63.6 %Grand County63.6Larimer County: 63.1 %Larimer County63.1Clear Creek County: 62.9 %Clear Creek County62.9Jefferson County: 62.9 %Jefferson County62.9Pitkin County: 62.8 %Pitkin County62.8Arapahoe County: 62.6 %Arapahoe County62.6Routt County: 62.5 %Routt County62.5El Paso County: 62.3 %El Paso County62.3Douglas County: 61.8 %Douglas County61.8Garfield County: 61.4 %Garfield County61.4Park County: 61.2 %Park County61.2Weld County: 61.1 %Weld County61.1Logan County: 60.4 %Logan County60.4Lincoln County: 60.3 %Lincoln County60.3Fremont County: 60.2 %Fremont County60.2La Plata County: 60.1 %La Plata County60.1Dolores County: 59.4 %Dolores County59.4Alamosa County: 59.1 %Alamosa County59.1Moffat County: 58.6 %Moffat County58.6Elbert County: 58.5 %Elbert County58.5Chaffee County: 57.7 %Chaffee County57.7Mesa County: 57.6 %Mesa County57.6Pueblo County: 57.5 %Pueblo County57.5Teller County: 56.6 %Teller County56.6Morgan County: 56.4 %Morgan County56.4Las Animas County: 55.8 %Las Animas County55.8Rio Blanco County: 55.7 %Rio Blanco County55.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Crowley County72.4-0.1 pts
2Denver County69.3+0.1 pts
3Summit County69.2-0.3 pts
4Gunnison County67.9-0.3 pts
5Eagle County65.9-0 pts
6San Miguel County65.7-0.2 pts
7Gilpin County65.3+0.6 pts
8San Juan County65.2-1 pts
9Boulder County65.1-0 pts
10Bent County64.9+0.7 pts
11Lake County64.7-0.2 pts
12Adams County64.1+0.3 pts
13Broomfield County64-0.1 pts
14Grand County63.6-0.5 pts
15Larimer County63.1-0.1 pts
16Clear Creek County62.9-0.8 pts
17Jefferson County62.90 pts
18Pitkin County62.8-0.4 pts
19Arapahoe County62.6-0 pts
20Routt County62.5-0.6 pts
21El Paso County62.3-0.2 pts
22Douglas County61.80 pts
23Garfield County61.4+0.3 pts
24Park County61.2-0.7 pts
25Weld County61.1+0.1 pts
26Logan County60.4-0.7 pts
27Lincoln County60.3-0.5 pts
28Fremont County60.2-0.1 pts
29La Plata County60.1-0.6 pts
30Dolores County59.4-0.2 pts
31Alamosa County59.1-0.2 pts
32Moffat County58.6-0.1 pts
33Elbert County58.5-0.5 pts
34Chaffee County57.70 pts
35Mesa County57.6-0.3 pts
36Pueblo County57.5-0.1 pts
37Teller County56.6-0.4 pts
38Morgan County56.4-0.1 pts
39Las Animas County55.80 pts
40Rio Blanco County55.7-0.5 pts
41Prowers County55.5-0.3 pts
42Rio Grande County54.9-0.3 pts
43Saguache County54.7-0.9 pts
44Otero County54.5-0.3 pts
45Ouray County54.4-0.3 pts
46Kit Carson County54.3-0.2 pts
47Montezuma County54-0.5 pts
48Phillips County53.9-0.1 pts
49Mineral County53.7-0.6 pts
50Jackson County53.6-1.2 pts
51Montrose County53.6-0.1 pts
52Yuma County53.2-0.6 pts
53Washington County53.2-0.6 pts
54Archuleta County52.5-0.3 pts
55Costilla County52.3+0.1 pts
56Cheyenne County52.2+0.9 pts
57Baca County51.9-0.6 pts
58Delta County51.7-0.3 pts
59Huerfano County51.5-0.6 pts
60Conejos County51.3-0.3 pts
61Custer County50.6+0.1 pts
62Kiowa County50.5-1.2 pts
63Sedgwick County49.8-0.3 pts
64Hinsdale County47.1-2.3 pts

Other periods

About this ranking

Residents aged 18 to 64 as a percentage of total population on 1 July. United States: Census Bureau county population estimates by age; states and the nation are sums of their counties.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Census Bureau. (2026). Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties (Counties in Colorado by population aged 18 to 64, 2023) [Data set]. Retrieved October 12, 2026, from https://www.census.gov/programs-surveys/popest/data/data-sets.html

MLA 9

Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Colorado by population aged 18 to 64, 2023. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-18-64/colorado-counties?period=2023. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Counties in Colorado by population aged 18 to 64, 2023. Dataset. Accessed October 12, 2026. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Also distributed by Invokely, https://invokely.ai/rankings/population-18-64/colorado-counties?period=2023.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties, Counties in Colorado by population aged 18 to 64, 2023 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/colorado-counties?period=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_colorado_by_2023,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Colorado by population aged 18 to 64, 2023}},
  year = {2026},
  howpublished = {Data set},
  url = {https://www.census.gov/programs-surveys/popest/data/data-sets.html},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/population-18-64/colorado-counties?period=2023. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Census Bureau
TI  - Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties: Counties in Colorado by population aged 18 to 64, 2023
PY  - 2026
DA  - 2026/06/25
PB  - U.S. Census Bureau
DB  - Invokely
UR  - https://www.census.gov/programs-surveys/popest/data/data-sets.html
L2  - https://invokely.ai/rankings/population-18-64/colorado-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/colorado-counties?period=2023.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. https://www.census.gov/programs-surveys/popest/data/data-sets.html. Retrieved 2026-10-12.
ER  -
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Rank Counties in Colorado by population aged 18 to 64 using official data, and cite the source.
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Questions

Which county has the highest population aged 18 to 64?

Crowley County, with 72.4% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Hinsdale County, with 47.1% in 2023.

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: residents aged 18 to 64 as a percentage of the total on 1 July, 2010 to 2019 from the 2010 to 2020 intercensal file and 2020 onwards from the latest vintage; states and the nation summed from counties. Retrieved 2026-10-12.

Population aged 18 to 64: other rankings

Counties in Colorado: more rankings