Data / Rankings / Population under 18 / Counties in South Dakota

Counties in South Dakota by population under 18

Todd County had the highest population under 18 of 66 counties in 2022, at 40.3%. Fall River County had the lowest, at 16.2%. The median was 24% and the figure for South Dakota was 24.3%. Source: the U.S. Census Bureau.

Highest40.3Todd County
Lowest16.2Fall River County
Median2466 counties
South Dakota24.3History

Top 40 counties, 2022

Todd County: 40.3 %Todd County40.3Buffalo County: 37.6 %Buffalo County37.6Oglala Lakota County: 36.8 %Oglala Lakota County36.8Jackson County: 36.1 %Jackson County36.1Dewey County: 35.4 %Dewey County35.4Corson County: 35.4 %Corson County35.4Hamlin County: 33 %Hamlin County33Ziebach County: 32.5 %Ziebach County32.5Mellette County: 32.2 %Mellette County32.2Bennett County: 31.2 %Bennett County31.2Charles Mix County: 29.2 %Charles Mix County29.2Lyman County: 29.2 %Lyman County29.2Hanson County: 28.9 %Hanson County28.9Roberts County: 28.4 %Roberts County28.4Beadle County: 27.9 %Beadle County27.9Clark County: 27.7 %Clark County27.7Lincoln County: 26.9 %Lincoln County26.9Moody County: 26.6 %Moody County26.6McCook County: 26.5 %McCook County26.5Turner County: 26 %Turner County26Marshall County: 25.9 %Marshall County25.9Hutchinson County: 25.7 %Hutchinson County25.7Aurora County: 25.5 %Aurora County25.5Sanborn County: 25.2 %Sanborn County25.2Minnehaha County: 24.9 %Minnehaha County24.9Jones County: 24.9 %Jones County24.9Butte County: 24.8 %Butte County24.8Harding County: 24.8 %Harding County24.8Douglas County: 24.6 %Douglas County24.6Deuel County: 24.6 %Deuel County24.6Stanley County: 24.4 %Stanley County24.4Hughes County: 24.2 %Hughes County24.2Kingsbury County: 24 %Kingsbury County24Gregory County: 23.9 %Gregory County23.9Tripp County: 23.9 %Tripp County23.9Union County: 23.8 %Union County23.8Brule County: 23.7 %Brule County23.7Jerauld County: 23.7 %Jerauld County23.7Spink County: 23.5 %Spink County23.5Faulk County: 23.3 %Faulk County23.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2022 (%)Change on 2021
1Todd County40.3-0.3 pts
2Buffalo County37.6-0.2 pts
3Oglala Lakota County36.8-0.6 pts
4Jackson County36.1+0.1 pts
5Dewey County35.4+0.6 pts
6Corson County35.4-0.1 pts
7Hamlin County33-0.2 pts
8Ziebach County32.5+0.2 pts
9Mellette County32.2-0.8 pts
10Bennett County31.2-0.1 pts
11Charles Mix County29.2+0.1 pts
12Lyman County29.2+0.2 pts
13Hanson County28.9-0 pts
14Roberts County28.40 pts
15Beadle County27.90 pts
16Clark County27.7-0.2 pts
17Lincoln County26.9-0.3 pts
18Moody County26.6-0.1 pts
19McCook County26.5+0.4 pts
20Turner County26+0.4 pts
21Marshall County25.9+0.2 pts
22Hutchinson County25.7-0.1 pts
23Aurora County25.5-0 pts
24Sanborn County25.2+1.1 pts
25Minnehaha County24.9-0.2 pts
26Jones County24.9-0.2 pts
27Butte County24.8-0.2 pts
28Harding County24.8+0.3 pts
29Douglas County24.6+0.3 pts
30Deuel County24.6+0.6 pts
31Stanley County24.4-0.7 pts
32Hughes County24.2+0.2 pts
33Kingsbury County24+0.3 pts
34Gregory County23.9+0.6 pts
35Tripp County23.9-0.2 pts
36Union County23.8-0.4 pts
37Brule County23.7+0.1 pts
38Jerauld County23.7+1.2 pts
39Spink County23.5+0.2 pts
40Faulk County23.3+0.2 pts
41Brown County23.2-0.3 pts
42Miner County22.8-0.3 pts
43Davison County22.8-0.3 pts
44Codington County22.7-0.5 pts
45Walworth County22.6+0.3 pts
46Haakon County22.6+0.1 pts
47Day County22.6+0.1 pts
48Edmunds County22.5-0.1 pts
49Pennington County22.5-0.3 pts
50Meade County22.4-0.7 pts
51Grant County22.4+0.2 pts
52Hand County22.3+0.7 pts
53Lake County21.4-0.1 pts
54Brookings County21.1-0.1 pts
55Hyde County21-0.8 pts
56Perkins County21-0.1 pts
57Yankton County20.9-0.2 pts
58Campbell County20.5+0.9 pts
59McPherson County19.5-0.1 pts
60Potter County19.3-0.4 pts
61Sully County19-1.7 pts
62Bon Homme County19+0.3 pts
63Lawrence County18-0.5 pts
64Custer County17+0.2 pts
65Clay County16.9-0.4 pts
66Fall River County16.2-0.4 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 South Dakota 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 South Dakota 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/south-dakota-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 South Dakota 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/south-dakota-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 South Dakota 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/south-dakota-counties?period=2022 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_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 South Dakota 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/south-dakota-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 South Dakota 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/south-dakota-counties?period=2022
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-dakota-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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Questions

Which county has the highest population under 18?

Todd County, with 40.3% in 2022, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Fall River County, with 16.2% 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 South Dakota: more rankings