Data / Rankings / Population under 18 / Counties in Wyoming

Counties in Wyoming by population under 18, 2025

Campbell County had the highest population under 18 of 23 counties in 2025, at 25.9%. Albany County had the lowest, at 15.4%. The median was 21.1% and the figure for Wyoming was 21.6%. Source: the U.S. Census Bureau.

Highest25.9Campbell County
Lowest15.4Albany County
Median21.123 counties
Wyoming21.6History

All counties, 2025

Campbell County: 25.9 %Campbell County25.9Uinta County: 25.2 %Uinta County25.2Crook County: 24.6 %Crook County24.6Converse County: 24 %Converse County24Sweetwater County: 23.8 %Sweetwater County23.8Lincoln County: 23.3 %Lincoln County23.3Big Horn County: 23.3 %Big Horn County23.3Fremont County: 22.7 %Fremont County22.7Natrona County: 22.6 %Natrona County22.6Laramie County: 21.5 %Laramie County21.5Carbon County: 21.3 %Carbon County21.3Sublette County: 21.1 %Sublette County21.1Sheridan County: 20.4 %Sheridan County20.4Washakie County: 20.3 %Washakie County20.3Hot Springs County: 20.1 %Hot Springs County20.1Goshen County: 19.9 %Goshen County19.9Johnson County: 19.4 %Johnson County19.4Platte County: 19.3 %Platte County19.3Park County: 19.3 %Park County19.3Weston County: 19 %Weston County19Teton County: 16.6 %Teton County16.6Niobrara County: 16.5 %Niobrara County16.5Albany County: 15.4 %Albany County15.4
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Campbell County25.9-0.6 pts
2Uinta County25.2-0.3 pts
3Crook County24.6-0.1 pts
4Converse County24-0.3 pts
5Sweetwater County23.8-0.7 pts
6Lincoln County23.3-0.5 pts
7Big Horn County23.3-0.5 pts
8Fremont County22.7-0.7 pts
9Natrona County22.6-0.5 pts
10Laramie County21.5-0.3 pts
11Carbon County21.3-0.1 pts
12Sublette County21.1-0.8 pts
13Sheridan County20.4-0.4 pts
14Washakie County20.3-0.4 pts
15Hot Springs County20.1-0.1 pts
16Goshen County19.9-0.4 pts
17Johnson County19.4-0.3 pts
18Platte County19.3+0.2 pts
19Park County19.3-0.6 pts
20Weston County19-0.3 pts
21Teton County16.6-0.6 pts
22Niobrara County16.5+0.3 pts
23Albany County15.4-0.2 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 Wyoming by population under 18, 2025) [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 Wyoming by population under 18, 2025. 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/wyoming-counties. 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 Wyoming by population under 18, 2025. 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/wyoming-counties.

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 Wyoming by population under 18, 2025 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-under-18/wyoming-counties (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_wyoming_by_2025,
  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 Wyoming by population under 18, 2025}},
  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/wyoming-counties. 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 Wyoming by population under 18, 2025
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/wyoming-counties
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/wyoming-counties.
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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Questions

Which county has the highest population under 18?

Campbell County, with 25.9% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Albany County, with 15.4% in 2025.

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 Wyoming: more rankings