Data / Rankings / Population under 18 / Counties in Colorado

Counties in Colorado by population under 18

Yuma County had the highest population under 18 of 64 counties in 2022, at 27.4%. Mineral County had the lowest, at 9.5%. The median was 19.2% and the figure for Colorado was 21.1%. Source: the U.S. Census Bureau.

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Highest27.4Yuma County
Lowest9.5Mineral County
Median19.264 counties
Colorado21.1History

Map of counties, 2022

Adams County: 24.5 %Alamosa County: 24 %Arapahoe County: 22.7 %Archuleta County: 17.5 %Baca County: 21.7 %Bent County: 16.5 %Boulder County: 17.8 %Broomfield County: 20.3 %Chaffee County: 15.2 %Cheyenne County: 25.4 %Clear Creek County: 13.4 %Conejos County: 26.8 %Costilla County: 18.2 %Crowley County: 11.3 %Custer County: 15.9 %Delta County: 19.5 %Denver County: 18.4 %Dolores County: 16.4 %Douglas County: 24 %Eagle County: 20.7 %Elbert County: 21.6 %El Paso County: 23 %Fremont County: 15.6 %Garfield County: 24.1 %Gilpin County: 14.5 %Grand County: 15.4 %Gunnison County: 16.3 %Hinsdale County: 15.6 %Huerfano County: 15.5 %Jackson County: 17.7 %Jefferson County: 18.5 %Kiowa County: 23.8 %Kit Carson County: 25.1 %Lake County: 21 %La Plata County: 17.7 %Larimer County: 18.5 %Las Animas County: 17.6 %Lincoln County: 20.5 %Logan County: 19.1 %Mesa County: 20.3 %Mineral County: 9.5 %Moffat County: 23.8 %Montezuma County: 20.8 %Montrose County: 20.3 %Morgan County: 26.5 %Otero County: 23.2 %Ouray County: 13.7 %Park County: 15.2 %Phillips County: 24.4 %Pitkin County: 16.2 %Prowers County: 25.5 %Pueblo County: 21.9 %Rio Blanco County: 24.1 %Rio Grande County: 21 %Routt County: 18.4 %Saguache County: 19.2 %San Juan County: 12.1 %San Miguel County: 18.2 %Sedgwick County: 19.2 %Summit County: 16.2 %Teller County: 16.6 %Washington County: 23.2 %Weld County: 25.9 %Yuma County: 27.4 %
  • Under 16
  • 16 to 18
  • 18 to 19
  • 19 to 22
  • 22 to 24
  • 24 and over
%, 2022. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2022

Yuma County: 27.4 %Yuma County27.4Conejos County: 26.8 %Conejos County26.8Morgan County: 26.5 %Morgan County26.5Weld County: 25.9 %Weld County25.9Prowers County: 25.5 %Prowers County25.5Cheyenne County: 25.4 %Cheyenne County25.4Kit Carson County: 25.1 %Kit Carson County25.1Adams County: 24.5 %Adams County24.5Phillips County: 24.4 %Phillips County24.4Garfield County: 24.1 %Garfield County24.1Rio Blanco County: 24.1 %Rio Blanco County24.1Alamosa County: 24 %Alamosa County24Douglas County: 24 %Douglas County24Moffat County: 23.8 %Moffat County23.8Kiowa County: 23.8 %Kiowa County23.8Washington County: 23.2 %Washington County23.2Otero County: 23.2 %Otero County23.2El Paso County: 23 %El Paso County23Arapahoe County: 22.7 %Arapahoe County22.7Pueblo County: 21.9 %Pueblo County21.9Baca County: 21.7 %Baca County21.7Elbert County: 21.6 %Elbert County21.6Lake County: 21 %Lake County21Rio Grande County: 21 %Rio Grande County21Montezuma County: 20.8 %Montezuma County20.8Eagle County: 20.7 %Eagle County20.7Lincoln County: 20.5 %Lincoln County20.5Mesa County: 20.3 %Mesa County20.3Broomfield County: 20.3 %Broomfield County20.3Montrose County: 20.3 %Montrose County20.3Delta County: 19.5 %Delta County19.5Saguache County: 19.2 %Saguache County19.2Sedgwick County: 19.2 %Sedgwick County19.2Logan County: 19.1 %Logan County19.1Jefferson County: 18.5 %Jefferson County18.5Larimer County: 18.5 %Larimer County18.5Routt County: 18.4 %Routt County18.4Denver County: 18.4 %Denver County18.4San Miguel County: 18.2 %San Miguel County18.2Costilla County: 18.2 %Costilla County18.2Yuma County: 27.4 %Yuma County27.4Conejos County: 26.8 %Conejos County26.8Morgan County: 26.5 %Morgan County26.5Weld County: 25.9 %Weld County25.9Prowers County: 25.5 %Prowers County25.5Cheyenne County: 25.4 %Cheyenne County25.4Kit Carson County: 25.1 %Kit Carson County25.1Adams County: 24.5 %Adams County24.5Phillips County: 24.4 %Phillips County24.4Garfield County: 24.1 %Garfield County24.1Rio Blanco County: 24.1 %Rio Blanco County24.1Alamosa County: 24 %Alamosa County24Douglas County: 24 %Douglas County24Moffat County: 23.8 %Moffat County23.8Kiowa County: 23.8 %Kiowa County23.8Washington County: 23.2 %Washington County23.2Otero County: 23.2 %Otero County23.2El Paso County: 23 %El Paso County23Arapahoe County: 22.7 %Arapahoe County22.7Pueblo County: 21.9 %Pueblo County21.9Baca County: 21.7 %Baca County21.7Elbert County: 21.6 %Elbert County21.6Lake County: 21 %Lake County21Rio Grande County: 21 %Rio Grande County21Montezuma County: 20.8 %Montezuma County20.8Eagle County: 20.7 %Eagle County20.7Lincoln County: 20.5 %Lincoln County20.5Mesa County: 20.3 %Mesa County20.3Broomfield County: 20.3 %Broomfield County20.3Montrose County: 20.3 %Montrose County20.3Delta County: 19.5 %Delta County19.5Saguache County: 19.2 %Saguache County19.2Sedgwick County: 19.2 %Sedgwick County19.2Logan County: 19.1 %Logan County19.1Jefferson County: 18.5 %Jefferson County18.5Larimer County: 18.5 %Larimer County18.5Routt County: 18.4 %Routt County18.4Denver County: 18.4 %Denver County18.4San Miguel County: 18.2 %San Miguel County18.2Costilla County: 18.2 %Costilla County18.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Yuma County27.4+0.4 pts
2Conejos County26.8-0.2 pts
3Morgan County26.5+0.2 pts
4Weld County25.9-0.3 pts
5Prowers County25.5-0 pts
6Cheyenne County25.4+0.7 pts
7Kit Carson County25.1+0.1 pts
8Adams County24.5-0.5 pts
9Phillips County24.4-0.9 pts
10Garfield County24.1-0.4 pts
11Rio Blanco County24.1-0.4 pts
12Alamosa County24+0.3 pts
13Douglas County24-0.6 pts
14Moffat County23.8-0.4 pts
15Kiowa County23.8+0.2 pts
16Washington County23.2+0.6 pts
17Otero County23.2-0.1 pts
18El Paso County23-0.3 pts
19Arapahoe County22.7-0.4 pts
20Pueblo County21.9-0.2 pts
21Baca County21.7-0.1 pts
22Elbert County21.60 pts
23Lake County21-0.1 pts
24Rio Grande County21-0.5 pts
25Montezuma County20.8-0.1 pts
26Eagle County20.7-0.7 pts
27Lincoln County20.5+0.2 pts
28Mesa County20.3-0.4 pts
29Broomfield County20.3-0.7 pts
30Montrose County20.3-0.4 pts
31Delta County19.5-0.4 pts
32Saguache County19.2+0.1 pts
33Sedgwick County19.20 pts
34Logan County19.1-0.2 pts
35Jefferson County18.5-0.5 pts
36Larimer County18.5-0.4 pts
37Routt County18.4-0.3 pts
38Denver County18.4-0.5 pts
39San Miguel County18.2-0.7 pts
40Costilla County18.2-0.6 pts
41Boulder County17.8-0.6 pts
42La Plata County17.7-0.6 pts
43Jackson County17.7+0.1 pts
44Las Animas County17.6+0.1 pts
45Archuleta County17.5-0.5 pts
46Teller County16.6-0.1 pts
47Bent County16.5-0.6 pts
48Dolores County16.4+0.5 pts
49Gunnison County16.3-0.3 pts
50Summit County16.2-0 pts
51Pitkin County16.2-0.3 pts
52Custer County15.9+1 pts
53Fremont County15.6-0.3 pts
54Hinsdale County15.6+0.5 pts
55Huerfano County15.5-0.1 pts
56Grand County15.4-0.6 pts
57Park County15.2-0.2 pts
58Chaffee County15.2-0.3 pts
59Gilpin County14.5-0.3 pts
60Ouray County13.70 pts
61Clear Creek County13.4-0.4 pts
62San Juan County12.1-2 pts
63Crowley County11.3+0.3 pts
64Mineral County9.5+0.5 pts

Other periods

About this ranking

Residents aged 0 to 17 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.

Uses the US age of majority. Not comparable with population_0_14_share, which stops at 14.

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 0 to 17 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 0 to 17 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 under 18, 2022) [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 0 to 17 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 under 18, 2022. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-under-18/colorado-counties?period=2022. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2022. 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-under-18/colorado-counties?period=2022.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2022 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/colorado-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_colorado_by_2022,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18, 2022}},
  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-under-18/colorado-counties?period=2022. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 0 to 17 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 under 18, 2022
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-under-18/colorado-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/colorado-counties?period=2022.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 0 to 17 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 under 18 using official data, and cite the source.
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Questions

Which county has the highest population under 18?

Yuma County, with 27.4% in 2022, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Mineral County, with 9.5% in 2022.

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 0 to 17 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 under 18: other rankings

Counties in Colorado: more rankings