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 2016, at 40.6%. Custer County had the lowest, at 17%. The median was 23.6% and the figure for South Dakota was 24.8%. Source: the U.S. Census Bureau.

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Highest40.6Todd County
Lowest17Custer County
Median23.666 counties
South Dakota24.8History

Map of counties, 2016

Aurora County: 26.9 %Beadle County: 26.7 %Bennett County: 32.8 %Bon Homme County: 18.5 %Brookings County: 20.3 %Brown County: 23.9 %Brule County: 24.4 %Buffalo County: 39 %Butte County: 23.9 %Campbell County: 18.5 %Charles Mix County: 29.2 %Clark County: 24.9 %Clay County: 17.4 %Codington County: 24.3 %Corson County: 34.8 %Custer County: 17 %Davison County: 22.9 %Day County: 23.1 %Deuel County: 23.1 %Dewey County: 32.9 %Douglas County: 22.2 %Edmunds County: 23.7 %Fall River County: 18.3 %Faulk County: 21.3 %Grant County: 22.8 %Gregory County: 22.3 %Haakon County: 22.6 %Hamlin County: 31.4 %Hand County: 21 %Hanson County: 31.2 %Harding County: 24.7 %Hughes County: 23.4 %Hutchinson County: 24.6 %Hyde County: 19.9 %Jackson County: 31.4 %Jerauld County: 23.5 %Jones County: 21.3 %Kingsbury County: 21.9 %Lake County: 21.6 %Lawrence County: 19.3 %Lincoln County: 29.1 %Lyman County: 29.8 %McCook County: 25.6 %McPherson County: 21.3 %Marshall County: 22.8 %Meade County: 25.7 %Mellette County: 32.3 %Miner County: 23.6 %Minnehaha County: 25.3 %Moody County: 25.4 %Oglala Lakota County: 38 %Pennington County: 23.4 %Perkins County: 21.3 %Potter County: 20.3 %Roberts County: 27.5 %Sanborn County: 24 %Spink County: 23.3 %Stanley County: 24.3 %Sully County: 22 %Todd County: 40.6 %Tripp County: 23.5 %Turner County: 24.2 %Union County: 25.1 %Walworth County: 23.2 %Yankton County: 21.2 %Ziebach County: 37.4 %
  • Under 21
  • 21 to 23
  • 23 to 24
  • 24 to 25
  • 25 to 30
  • 30 and over
%, 2016. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2016

Todd County: 40.6 %Todd County40.6Buffalo County: 39 %Buffalo County39Oglala Lakota County: 38 %Oglala Lakota County38Ziebach County: 37.4 %Ziebach County37.4Corson County: 34.8 %Corson County34.8Dewey County: 32.9 %Dewey County32.9Bennett County: 32.8 %Bennett County32.8Mellette County: 32.3 %Mellette County32.3Hamlin County: 31.4 %Hamlin County31.4Jackson County: 31.4 %Jackson County31.4Hanson County: 31.2 %Hanson County31.2Lyman County: 29.8 %Lyman County29.8Charles Mix County: 29.2 %Charles Mix County29.2Lincoln County: 29.1 %Lincoln County29.1Roberts County: 27.5 %Roberts County27.5Aurora County: 26.9 %Aurora County26.9Beadle County: 26.7 %Beadle County26.7Meade County: 25.7 %Meade County25.7McCook County: 25.6 %McCook County25.6Moody County: 25.4 %Moody County25.4Minnehaha County: 25.3 %Minnehaha County25.3Union County: 25.1 %Union County25.1Clark County: 24.9 %Clark County24.9Harding County: 24.7 %Harding County24.7Hutchinson County: 24.6 %Hutchinson County24.6Brule County: 24.4 %Brule County24.4Codington County: 24.3 %Codington County24.3Stanley County: 24.3 %Stanley County24.3Turner County: 24.2 %Turner County24.2Sanborn County: 24 %Sanborn County24Brown County: 23.9 %Brown County23.9Butte County: 23.9 %Butte County23.9Edmunds County: 23.7 %Edmunds County23.7Miner County: 23.6 %Miner County23.6Jerauld County: 23.5 %Jerauld County23.5Tripp County: 23.5 %Tripp County23.5Pennington County: 23.4 %Pennington County23.4Hughes County: 23.4 %Hughes County23.4Spink County: 23.3 %Spink County23.3Walworth County: 23.2 %Walworth County23.2Todd County: 40.6 %Todd County40.6Buffalo County: 39 %Buffalo County39Oglala Lakota County: 38 %Oglala Lakota County38Ziebach County: 37.4 %Ziebach County37.4Corson County: 34.8 %Corson County34.8Dewey County: 32.9 %Dewey County32.9Bennett County: 32.8 %Bennett County32.8Mellette County: 32.3 %Mellette County32.3Hamlin County: 31.4 %Hamlin County31.4Jackson County: 31.4 %Jackson County31.4Hanson County: 31.2 %Hanson County31.2Lyman County: 29.8 %Lyman County29.8Charles Mix County: 29.2 %Charles Mix County29.2Lincoln County: 29.1 %Lincoln County29.1Roberts County: 27.5 %Roberts County27.5Aurora County: 26.9 %Aurora County26.9Beadle County: 26.7 %Beadle County26.7Meade County: 25.7 %Meade County25.7McCook County: 25.6 %McCook County25.6Moody County: 25.4 %Moody County25.4Minnehaha County: 25.3 %Minnehaha County25.3Union County: 25.1 %Union County25.1Clark County: 24.9 %Clark County24.9Harding County: 24.7 %Harding County24.7Hutchinson County: 24.6 %Hutchinson County24.6Brule County: 24.4 %Brule County24.4Codington County: 24.3 %Codington County24.3Stanley County: 24.3 %Stanley County24.3Turner County: 24.2 %Turner County24.2Sanborn County: 24 %Sanborn County24Brown County: 23.9 %Brown County23.9Butte County: 23.9 %Butte County23.9Edmunds County: 23.7 %Edmunds County23.7Miner County: 23.6 %Miner County23.6Jerauld County: 23.5 %Jerauld County23.5Tripp County: 23.5 %Tripp County23.5Pennington County: 23.4 %Pennington County23.4Hughes County: 23.4 %Hughes County23.4Spink County: 23.3 %Spink County23.3Walworth County: 23.2 %Walworth County23.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2016 (%)Change on 2015
1Todd County40.6-0.1 pts
2Buffalo County39-0.6 pts
3Oglala Lakota County38-0.3 pts
4Ziebach County37.4-0.3 pts
5Corson County34.80 pts
6Dewey County32.9+0.6 pts
7Bennett County32.8-0.2 pts
8Mellette County32.3+1.4 pts
9Hamlin County31.4-0.1 pts
10Jackson County31.4-0.6 pts
11Hanson County31.2-1 pts
12Lyman County29.8+0.6 pts
13Charles Mix County29.2-0.2 pts
14Lincoln County29.1-0.4 pts
15Roberts County27.5-0.4 pts
16Aurora County26.9+0.5 pts
17Beadle County26.7+0.2 pts
18Meade County25.7+0.1 pts
19McCook County25.6-0.1 pts
20Moody County25.4+0.2 pts
21Minnehaha County25.3+0.1 pts
22Union County25.1+0.4 pts
23Clark County24.9+0.6 pts
24Harding County24.7+0.6 pts
25Hutchinson County24.6+0.6 pts
26Brule County24.4-0 pts
27Codington County24.3-0.1 pts
28Stanley County24.3+0.7 pts
29Turner County24.2+0.4 pts
30Sanborn County24+0.8 pts
31Brown County23.9+0.3 pts
32Butte County23.9-0.4 pts
33Edmunds County23.7-0.1 pts
34Miner County23.6+1.2 pts
35Jerauld County23.5-0.1 pts
36Tripp County23.5+0.8 pts
37Pennington County23.4-0.2 pts
38Hughes County23.4-0.4 pts
39Spink County23.3-0.4 pts
40Walworth County23.2+0.6 pts
41Deuel County23.1-0 pts
42Day County23.1+0.8 pts
43Davison County22.9+0.3 pts
44Marshall County22.8+0.3 pts
45Grant County22.8+0.4 pts
46Haakon County22.6+0.7 pts
47Gregory County22.3-0.1 pts
48Douglas County22.2-0.3 pts
49Sully County22-0.3 pts
50Kingsbury County21.9-0.3 pts
51Lake County21.6+0.3 pts
52Faulk County21.3-0 pts
53Jones County21.3+0.4 pts
54Perkins County21.3-0.2 pts
55McPherson County21.3+0.6 pts
56Yankton County21.2-0.1 pts
57Hand County21-0.3 pts
58Potter County20.3+0.2 pts
59Brookings County20.3-0 pts
60Hyde County19.9-1.3 pts
61Lawrence County19.3+0.2 pts
62Campbell County18.5-0.2 pts
63Bon Homme County18.5-0.1 pts
64Fall River County18.3-0.2 pts
65Clay County17.4+0.1 pts
66Custer County17-0.4 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, 2016) [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, 2016. 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=2016. 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, 2016. 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=2016.

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, 2016 [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=2016 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2016,
  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, 2016}},
  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=2016. 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, 2016
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=2016
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-dakota-counties?period=2016.
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 40.6% in 2016, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Custer County, with 17% in 2016.

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