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 2017, at 41%. Custer County had the lowest, at 16.8%. The median was 23.7% and the figure for South Dakota was 24.8%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest41Todd County
Lowest16.8Custer County
Median23.766 counties
South Dakota24.8History

Map of counties, 2017

Aurora County: 25.8 %Beadle County: 26.9 %Bennett County: 32.9 %Bon Homme County: 18.7 %Brookings County: 20.4 %Brown County: 24 %Brule County: 24.8 %Buffalo County: 39 %Butte County: 23.8 %Campbell County: 18.9 %Charles Mix County: 29 %Clark County: 25.6 %Clay County: 17.3 %Codington County: 24.1 %Corson County: 36.2 %Custer County: 16.8 %Davison County: 22.8 %Day County: 23 %Deuel County: 23.3 %Dewey County: 32.7 %Douglas County: 23.1 %Edmunds County: 23.3 %Fall River County: 17.5 %Faulk County: 21.8 %Grant County: 22.6 %Gregory County: 22.2 %Haakon County: 23.8 %Hamlin County: 31.4 %Hand County: 21.4 %Hanson County: 30.9 %Harding County: 24.4 %Hughes County: 23.6 %Hutchinson County: 24.8 %Hyde County: 20.5 %Jackson County: 31.8 %Jerauld County: 23.5 %Jones County: 23 %Kingsbury County: 22.5 %Lake County: 21.4 %Lawrence County: 19.3 %Lincoln County: 29 %Lyman County: 30.1 %McCook County: 25.5 %McPherson County: 21.7 %Marshall County: 23.2 %Meade County: 25.3 %Mellette County: 32 %Miner County: 23.5 %Minnehaha County: 25.3 %Moody County: 26 %Oglala Lakota County: 38.1 %Pennington County: 23.3 %Perkins County: 21.2 %Potter County: 19.9 %Roberts County: 27.6 %Sanborn County: 25.8 %Spink County: 23.6 %Stanley County: 24.5 %Sully County: 21.7 %Todd County: 41 %Tripp County: 23.4 %Turner County: 24.6 %Union County: 24.8 %Walworth County: 23.1 %Yankton County: 21.4 %Ziebach County: 35.7 %
  • Under 21
  • 21 to 23
  • 23 to 24
  • 24 to 25
  • 25 to 30
  • 30 and over
%, 2017. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2017

Todd County: 41 %Todd County41Buffalo County: 39 %Buffalo County39Oglala Lakota County: 38.1 %Oglala Lakota County38.1Corson County: 36.2 %Corson County36.2Ziebach County: 35.7 %Ziebach County35.7Bennett County: 32.9 %Bennett County32.9Dewey County: 32.7 %Dewey County32.7Mellette County: 32 %Mellette County32Jackson County: 31.8 %Jackson County31.8Hamlin County: 31.4 %Hamlin County31.4Hanson County: 30.9 %Hanson County30.9Lyman County: 30.1 %Lyman County30.1Charles Mix County: 29 %Charles Mix County29Lincoln County: 29 %Lincoln County29Roberts County: 27.6 %Roberts County27.6Beadle County: 26.9 %Beadle County26.9Moody County: 26 %Moody County26Sanborn County: 25.8 %Sanborn County25.8Aurora County: 25.8 %Aurora County25.8Clark County: 25.6 %Clark County25.6McCook County: 25.5 %McCook County25.5Meade County: 25.3 %Meade County25.3Minnehaha County: 25.3 %Minnehaha County25.3Brule County: 24.8 %Brule County24.8Union County: 24.8 %Union County24.8Hutchinson County: 24.8 %Hutchinson County24.8Turner County: 24.6 %Turner County24.6Stanley County: 24.5 %Stanley County24.5Harding County: 24.4 %Harding County24.4Codington County: 24.1 %Codington County24.1Brown County: 24 %Brown County24Haakon County: 23.8 %Haakon County23.8Butte County: 23.8 %Butte County23.8Spink County: 23.6 %Spink County23.6Hughes County: 23.6 %Hughes County23.6Miner County: 23.5 %Miner County23.5Jerauld County: 23.5 %Jerauld County23.5Tripp County: 23.4 %Tripp County23.4Edmunds County: 23.3 %Edmunds County23.3Deuel County: 23.3 %Deuel County23.3Todd County: 41 %Todd County41Buffalo County: 39 %Buffalo County39Oglala Lakota County: 38.1 %Oglala Lakota County38.1Corson County: 36.2 %Corson County36.2Ziebach County: 35.7 %Ziebach County35.7Bennett County: 32.9 %Bennett County32.9Dewey County: 32.7 %Dewey County32.7Mellette County: 32 %Mellette County32Jackson County: 31.8 %Jackson County31.8Hamlin County: 31.4 %Hamlin County31.4Hanson County: 30.9 %Hanson County30.9Lyman County: 30.1 %Lyman County30.1Charles Mix County: 29 %Charles Mix County29Lincoln County: 29 %Lincoln County29Roberts County: 27.6 %Roberts County27.6Beadle County: 26.9 %Beadle County26.9Moody County: 26 %Moody County26Sanborn County: 25.8 %Sanborn County25.8Aurora County: 25.8 %Aurora County25.8Clark County: 25.6 %Clark County25.6McCook County: 25.5 %McCook County25.5Meade County: 25.3 %Meade County25.3Minnehaha County: 25.3 %Minnehaha County25.3Brule County: 24.8 %Brule County24.8Union County: 24.8 %Union County24.8Hutchinson County: 24.8 %Hutchinson County24.8Turner County: 24.6 %Turner County24.6Stanley County: 24.5 %Stanley County24.5Harding County: 24.4 %Harding County24.4Codington County: 24.1 %Codington County24.1Brown County: 24 %Brown County24Haakon County: 23.8 %Haakon County23.8Butte County: 23.8 %Butte County23.8Spink County: 23.6 %Spink County23.6Hughes County: 23.6 %Hughes County23.6Miner County: 23.5 %Miner County23.5Jerauld County: 23.5 %Jerauld County23.5Tripp County: 23.4 %Tripp County23.4Edmunds County: 23.3 %Edmunds County23.3Deuel County: 23.3 %Deuel County23.3
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2017 (%)Change on 2016
1Todd County41+0.4 pts
2Buffalo County39-0 pts
3Oglala Lakota County38.1+0.1 pts
4Corson County36.2+1.4 pts
5Ziebach County35.7-1.7 pts
6Bennett County32.9+0.1 pts
7Dewey County32.7-0.3 pts
8Mellette County32-0.3 pts
9Jackson County31.8+0.4 pts
10Hamlin County31.40 pts
11Hanson County30.9-0.3 pts
12Lyman County30.1+0.3 pts
13Charles Mix County29-0.3 pts
14Lincoln County29-0.1 pts
15Roberts County27.6+0.1 pts
16Beadle County26.9+0.2 pts
17Moody County26+0.5 pts
18Sanborn County25.8+1.8 pts
19Aurora County25.8-1.1 pts
20Clark County25.6+0.7 pts
21McCook County25.5-0 pts
22Meade County25.3-0.4 pts
23Minnehaha County25.3-0 pts
24Brule County24.8+0.4 pts
25Union County24.8-0.3 pts
26Hutchinson County24.8+0.1 pts
27Turner County24.6+0.3 pts
28Stanley County24.5+0.2 pts
29Harding County24.4-0.2 pts
30Codington County24.1-0.2 pts
31Brown County24+0.1 pts
32Haakon County23.8+1.2 pts
33Butte County23.8-0.1 pts
34Spink County23.6+0.4 pts
35Hughes County23.6+0.3 pts
36Miner County23.5-0.1 pts
37Jerauld County23.5-0 pts
38Tripp County23.4-0 pts
39Edmunds County23.3-0.3 pts
40Deuel County23.3+0.2 pts
41Pennington County23.3-0.2 pts
42Marshall County23.2+0.4 pts
43Walworth County23.1-0.1 pts
44Douglas County23.1+0.9 pts
45Day County23-0.1 pts
46Jones County23+1.6 pts
47Davison County22.8-0.1 pts
48Grant County22.6-0.2 pts
49Kingsbury County22.5+0.6 pts
50Gregory County22.2-0.2 pts
51Faulk County21.8+0.5 pts
52Sully County21.7-0.2 pts
53McPherson County21.7+0.4 pts
54Hand County21.4+0.4 pts
55Yankton County21.4+0.2 pts
56Lake County21.4-0.3 pts
57Perkins County21.2-0.1 pts
58Hyde County20.5+0.6 pts
59Brookings County20.4+0.1 pts
60Potter County19.9-0.4 pts
61Lawrence County19.3-0.1 pts
62Campbell County18.9+0.4 pts
63Bon Homme County18.7+0.2 pts
64Fall River County17.5-0.8 pts
65Clay County17.3-0.1 pts
66Custer County16.8-0.2 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 South Dakota by population under 18, 2017) [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, 2017. 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=2017. 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, 2017. 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=2017.

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, 2017 [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=2017 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2017,
  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, 2017}},
  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=2017. 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, 2017
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=2017
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-dakota-counties?period=2017.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in South Dakota by population under 18 using official data, and cite the source.
rank_places {"indicator":"population_0_17_share","level":"province","within":"South Dakota","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_0_17_share&level=province&within=South%20Dakota&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population under 18?

Todd County, with 41% in 2017, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Custer County, with 16.8% in 2017.

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