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 2023, at 39.3%. Fall River County had the lowest, at 15.7%. The median was 24.1% and the figure for South Dakota was 24.1%. Source: the U.S. Census Bureau.

Highest39.3Todd County
Lowest15.7Fall River County
Median24.166 counties
South Dakota24.1History

Top 40 counties, 2023

Todd County: 39.3 %Todd County39.3Dewey County: 38.6 %Dewey County38.6Buffalo County: 37.4 %Buffalo County37.4Oglala Lakota County: 36.2 %Oglala Lakota County36.2Corson County: 35.1 %Corson County35.1Jackson County: 34.9 %Jackson County34.9Mellette County: 33.6 %Mellette County33.6Hamlin County: 33.4 %Hamlin County33.4Ziebach County: 33 %Ziebach County33Bennett County: 31.3 %Bennett County31.3Charles Mix County: 29 %Charles Mix County29Hanson County: 28.6 %Hanson County28.6Roberts County: 28.4 %Roberts County28.4Clark County: 28.1 %Clark County28.1Beadle County: 27.9 %Beadle County27.9Lyman County: 27.8 %Lyman County27.8Turner County: 27 %Turner County27Moody County: 26.9 %Moody County26.9McCook County: 26.6 %McCook County26.6Marshall County: 26.4 %Marshall County26.4Lincoln County: 26 %Lincoln County26Hutchinson County: 25.7 %Hutchinson County25.7Jerauld County: 25.6 %Jerauld County25.6Aurora County: 25.3 %Aurora County25.3Douglas County: 25.2 %Douglas County25.2Tripp County: 24.9 %Tripp County24.9Harding County: 24.8 %Harding County24.8Minnehaha County: 24.7 %Minnehaha County24.7Deuel County: 24.7 %Deuel County24.7Faulk County: 24.7 %Faulk County24.7Sanborn County: 24.6 %Sanborn County24.6Kingsbury County: 24.5 %Kingsbury County24.5Butte County: 24.2 %Butte County24.2Brule County: 24 %Brule County24Stanley County: 24 %Stanley County24Hughes County: 23.8 %Hughes County23.8Union County: 23.7 %Union County23.7Haakon County: 23.6 %Haakon County23.6Gregory County: 23.6 %Gregory County23.6Jones County: 23.6 %Jones County23.6
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2023 (%)Change on 2022
1Todd County39.3-1.1 pts
2Dewey County38.6+3.1 pts
3Buffalo County37.4-0.2 pts
4Oglala Lakota County36.2-0.5 pts
5Corson County35.1-0.2 pts
6Jackson County34.9-1.2 pts
7Mellette County33.6+1.4 pts
8Hamlin County33.4+0.4 pts
9Ziebach County33+0.5 pts
10Bennett County31.30 pts
11Charles Mix County29-0.2 pts
12Hanson County28.6-0.3 pts
13Roberts County28.40 pts
14Clark County28.1+0.4 pts
15Beadle County27.90 pts
16Lyman County27.8-1.3 pts
17Turner County27+1.1 pts
18Moody County26.9+0.3 pts
19McCook County26.6+0.2 pts
20Marshall County26.4+0.5 pts
21Lincoln County26-0.9 pts
22Hutchinson County25.7+0.1 pts
23Jerauld County25.6+1.9 pts
24Aurora County25.3-0.2 pts
25Douglas County25.2+0.7 pts
26Tripp County24.9+1 pts
27Harding County24.8-0 pts
28Minnehaha County24.7-0.2 pts
29Deuel County24.7+0.1 pts
30Faulk County24.7+1.4 pts
31Sanborn County24.6-0.5 pts
32Kingsbury County24.5+0.5 pts
33Butte County24.2-0.5 pts
34Brule County24+0.3 pts
35Stanley County24-0.5 pts
36Hughes County23.8-0.3 pts
37Union County23.7-0.1 pts
38Haakon County23.6+1 pts
39Gregory County23.6-0.4 pts
40Jones County23.6-1.3 pts
41Walworth County23.2+0.5 pts
42Brown County22.9-0.3 pts
43Spink County22.9-0.6 pts
44Hand County22.7+0.4 pts
45Grant County22.6+0.2 pts
46Davison County22.5-0.4 pts
47Codington County22.4-0.3 pts
48Miner County22.4-0.5 pts
49Day County22.3-0.3 pts
50Pennington County22.3-0.2 pts
51Meade County22.1-0.3 pts
52Perkins County21.9+0.9 pts
53Edmunds County21.8-0.7 pts
54Lake County21.5+0.2 pts
55Hyde County21.5+0.5 pts
56Brookings County20.8-0.3 pts
57Yankton County20.5-0.4 pts
58Campbell County19.9-0.6 pts
59Potter County19.4+0.1 pts
60Bon Homme County190 pts
61McPherson County19-0.5 pts
62Sully County18.5-0.6 pts
63Lawrence County17.4-0.6 pts
64Clay County16.8-0 pts
65Custer County16.6-0.4 pts
66Fall River County15.7-0.5 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 South Dakota by population under 18, 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 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, 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-under-18/south-dakota-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 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, 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-under-18/south-dakota-counties?period=2023.

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, 2023 [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=2023 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2023,
  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, 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-under-18/south-dakota-counties?period=2023. 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, 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-under-18/south-dakota-counties?period=2023
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-dakota-counties?period=2023.
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 39.3% in 2023, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Fall River County, with 15.7% 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 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