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 2019, at 75.3%. Hinsdale County had the lowest, at 51.1%. The median was 59.7% and the figure for Colorado was 63.2%. Source: the U.S. Census Bureau.

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Highest75.3Crowley County
Lowest51.1Hinsdale County
Median59.764 counties
Colorado63.2History

Map of counties, 2019

Adams County: 63.1 %Alamosa County: 60.7 %Arapahoe County: 62.9 %Archuleta County: 54.1 %Baca County: 53 %Bent County: 66.3 %Boulder County: 65.8 %Broomfield County: 63.4 %Chaffee County: 58.5 %Cheyenne County: 53.9 %Clear Creek County: 64.1 %Conejos County: 52.6 %Costilla County: 54.4 %Crowley County: 75.3 %Custer County: 51.2 %Delta County: 53.4 %Denver County: 69.2 %Dolores County: 58.9 %Douglas County: 61.3 %Eagle County: 66.5 %Elbert County: 60.8 %El Paso County: 62.9 %Fremont County: 61.5 %Garfield County: 61.5 %Gilpin County: 66.5 %Grand County: 65.3 %Gunnison County: 68.4 %Hinsdale County: 51.1 %Huerfano County: 52.4 %Jackson County: 59.8 %Jefferson County: 63.2 %Kiowa County: 53.4 %Kit Carson County: 55.9 %Lake County: 67 %La Plata County: 62.2 %Larimer County: 63.8 %Las Animas County: 57.6 %Lincoln County: 62.2 %Logan County: 63.7 %Mesa County: 58.8 %Mineral County: 54.9 %Moffat County: 59.5 %Montezuma County: 55.9 %Montrose County: 54.6 %Morgan County: 57.1 %Otero County: 55 %Ouray County: 57.7 %Park County: 63.7 %Phillips County: 54.2 %Pitkin County: 64.9 %Prowers County: 57.3 %Pueblo County: 58.4 %Rio Blanco County: 57.3 %Rio Grande County: 55.4 %Routt County: 64.9 %Saguache County: 55.1 %San Juan County: 62.6 %San Miguel County: 66.7 %Sedgwick County: 52.9 %Summit County: 70.7 %Teller County: 59.7 %Washington County: 55.9 %Weld County: 61.1 %Yuma County: 54.9 %
  • Under 54
  • 54 to 57
  • 57 to 60
  • 60 to 63
  • 63 to 65
  • 65 and over
%, 2019. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2019

Crowley County: 75.3 %Crowley County75.3Summit County: 70.7 %Summit County70.7Denver County: 69.2 %Denver County69.2Gunnison County: 68.4 %Gunnison County68.4Lake County: 67 %Lake County67San Miguel County: 66.7 %San Miguel County66.7Gilpin County: 66.5 %Gilpin County66.5Eagle County: 66.5 %Eagle County66.5Bent County: 66.3 %Bent County66.3Boulder County: 65.8 %Boulder County65.8Grand County: 65.3 %Grand County65.3Routt County: 64.9 %Routt County64.9Pitkin County: 64.9 %Pitkin County64.9Clear Creek County: 64.1 %Clear Creek County64.1Larimer County: 63.8 %Larimer County63.8Park County: 63.7 %Park County63.7Logan County: 63.7 %Logan County63.7Broomfield County: 63.4 %Broomfield County63.4Jefferson County: 63.2 %Jefferson County63.2Adams County: 63.1 %Adams County63.1Arapahoe County: 62.9 %Arapahoe County62.9El Paso County: 62.9 %El Paso County62.9San Juan County: 62.6 %San Juan County62.6La Plata County: 62.2 %La Plata County62.2Lincoln County: 62.2 %Lincoln County62.2Garfield County: 61.5 %Garfield County61.5Fremont County: 61.5 %Fremont County61.5Douglas County: 61.3 %Douglas County61.3Weld County: 61.1 %Weld County61.1Elbert County: 60.8 %Elbert County60.8Alamosa County: 60.7 %Alamosa County60.7Jackson County: 59.8 %Jackson County59.8Teller County: 59.7 %Teller County59.7Moffat County: 59.5 %Moffat County59.5Dolores County: 58.9 %Dolores County58.9Mesa County: 58.8 %Mesa County58.8Chaffee County: 58.5 %Chaffee County58.5Pueblo County: 58.4 %Pueblo County58.4Ouray County: 57.7 %Ouray County57.7Las Animas County: 57.6 %Las Animas County57.6Crowley County: 75.3 %Crowley County75.3Summit County: 70.7 %Summit County70.7Denver County: 69.2 %Denver County69.2Gunnison County: 68.4 %Gunnison County68.4Lake County: 67 %Lake County67San Miguel County: 66.7 %San Miguel County66.7Gilpin County: 66.5 %Gilpin County66.5Eagle County: 66.5 %Eagle County66.5Bent County: 66.3 %Bent County66.3Boulder County: 65.8 %Boulder County65.8Grand County: 65.3 %Grand County65.3Routt County: 64.9 %Routt County64.9Pitkin County: 64.9 %Pitkin County64.9Clear Creek County: 64.1 %Clear Creek County64.1Larimer County: 63.8 %Larimer County63.8Park County: 63.7 %Park County63.7Logan County: 63.7 %Logan County63.7Broomfield County: 63.4 %Broomfield County63.4Jefferson County: 63.2 %Jefferson County63.2Adams County: 63.1 %Adams County63.1Arapahoe County: 62.9 %Arapahoe County62.9El Paso County: 62.9 %El Paso County62.9San Juan County: 62.6 %San Juan County62.6La Plata County: 62.2 %La Plata County62.2Lincoln County: 62.2 %Lincoln County62.2Garfield County: 61.5 %Garfield County61.5Fremont County: 61.5 %Fremont County61.5Douglas County: 61.3 %Douglas County61.3Weld County: 61.1 %Weld County61.1Elbert County: 60.8 %Elbert County60.8Alamosa County: 60.7 %Alamosa County60.7Jackson County: 59.8 %Jackson County59.8Teller County: 59.7 %Teller County59.7Moffat County: 59.5 %Moffat County59.5Dolores County: 58.9 %Dolores County58.9Mesa County: 58.8 %Mesa County58.8Chaffee County: 58.5 %Chaffee County58.5Pueblo County: 58.4 %Pueblo County58.4Ouray County: 57.7 %Ouray County57.7Las Animas County: 57.6 %Las Animas County57.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Crowley County75.3-0.1 pts
2Summit County70.7-0.1 pts
3Denver County69.2+0.3 pts
4Gunnison County68.4-0.4 pts
5Lake County67+0.1 pts
6San Miguel County66.7-0.6 pts
7Gilpin County66.50 pts
8Eagle County66.5-0.4 pts
9Bent County66.3-1.5 pts
10Boulder County65.8-0.4 pts
11Grand County65.3-0.8 pts
12Routt County64.9-0.7 pts
13Pitkin County64.9-0.9 pts
14Clear Creek County64.1-0.5 pts
15Larimer County63.8-0.3 pts
16Park County63.7-1 pts
17Logan County63.7-0.4 pts
18Broomfield County63.4+0.3 pts
19Jefferson County63.2-0.2 pts
20Adams County63.1+0.1 pts
21Arapahoe County62.9-0.2 pts
22El Paso County62.9-0.1 pts
23San Juan County62.6-2.4 pts
24La Plata County62.2-1 pts
25Lincoln County62.2-0.2 pts
26Garfield County61.5-0.4 pts
27Fremont County61.5-0.4 pts
28Douglas County61.3+0.1 pts
29Weld County61.1-0.1 pts
30Elbert County60.8-0.5 pts
31Alamosa County60.7-0 pts
32Jackson County59.8-0.6 pts
33Teller County59.7-1.1 pts
34Moffat County59.5+0.1 pts
35Dolores County58.9+0.4 pts
36Mesa County58.8-0.3 pts
37Chaffee County58.5-0.5 pts
38Pueblo County58.4-0.3 pts
39Ouray County57.7-0.4 pts
40Las Animas County57.6-0.2 pts
41Rio Blanco County57.3-1.6 pts
42Prowers County57.3+0.1 pts
43Morgan County57.1-0.2 pts
44Montezuma County55.9-0.4 pts
45Kit Carson County55.9-0.1 pts
46Washington County55.9-0.3 pts
47Rio Grande County55.4-0.3 pts
48Saguache County55.1-1.7 pts
49Otero County55-0.2 pts
50Yuma County54.9-0.2 pts
51Mineral County54.9+1.4 pts
52Montrose County54.6-0.3 pts
53Costilla County54.4+0.3 pts
54Phillips County54.2-0.4 pts
55Archuleta County54.1-0.7 pts
56Cheyenne County53.9-0.6 pts
57Kiowa County53.4-1.4 pts
58Delta County53.4-0.3 pts
59Baca County53+0.6 pts
60Sedgwick County52.9-0.8 pts
61Conejos County52.6-0.3 pts
62Huerfano County52.4-0.7 pts
63Custer County51.2-1 pts
64Hinsdale County51.1-0.7 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, 2019) [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, 2019. 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=2019. 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, 2019. 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=2019.

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, 2019 [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=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_colorado_by_2019,
  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, 2019}},
  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=2019. 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, 2019
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=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/colorado-counties?period=2019.
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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Questions

Which county has the highest population aged 18 to 64?

Crowley County, with 75.3% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Hinsdale County, with 51.1% in 2019.

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