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 2015, at 40.7%. Clay County had the lowest, at 17.3%. The median was 23.6% and the figure for South Dakota was 24.8%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest40.7Todd County
Lowest17.3Clay County
Median23.666 counties
South Dakota24.8History

Map of counties, 2015

Aurora County: 26.4 %Beadle County: 26.4 %Bennett County: 32.9 %Bon Homme County: 18.6 %Brookings County: 20.3 %Brown County: 23.6 %Brule County: 24.4 %Buffalo County: 39.6 %Butte County: 24.3 %Campbell County: 18.7 %Charles Mix County: 29.5 %Clark County: 24.3 %Clay County: 17.3 %Codington County: 24.4 %Corson County: 34.8 %Custer County: 17.4 %Davison County: 22.7 %Day County: 22.3 %Deuel County: 23.2 %Dewey County: 32.3 %Douglas County: 22.5 %Edmunds County: 23.8 %Fall River County: 18.5 %Faulk County: 21.4 %Grant County: 22.3 %Gregory County: 22.5 %Haakon County: 21.8 %Hamlin County: 31.4 %Hand County: 21.3 %Hanson County: 32.2 %Harding County: 24.1 %Hughes County: 23.7 %Hutchinson County: 24.1 %Hyde County: 21.3 %Jackson County: 31.9 %Jerauld County: 23.6 %Jones County: 20.9 %Kingsbury County: 22.2 %Lake County: 21.3 %Lawrence County: 19.1 %Lincoln County: 29.5 %Lyman County: 29.2 %McCook County: 25.7 %McPherson County: 20.6 %Marshall County: 22.5 %Meade County: 25.6 %Mellette County: 30.9 %Miner County: 22.4 %Minnehaha County: 25.2 %Moody County: 25.2 %Oglala Lakota County: 38.3 %Pennington County: 23.6 %Perkins County: 21.5 %Potter County: 20.1 %Roberts County: 27.8 %Sanborn County: 23.2 %Spink County: 23.6 %Stanley County: 23.6 %Sully County: 22.3 %Todd County: 40.7 %Tripp County: 22.6 %Turner County: 23.8 %Union County: 24.7 %Walworth County: 22.7 %Yankton County: 21.3 %Ziebach County: 37.7 %
  • Under 21
  • 21 to 22
  • 22 to 24
  • 24 to 25
  • 25 to 30
  • 30 and over
%, 2015. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2015

Todd County: 40.7 %Todd County40.7Buffalo County: 39.6 %Buffalo County39.6Oglala Lakota County: 38.3 %Oglala Lakota County38.3Ziebach County: 37.7 %Ziebach County37.7Corson County: 34.8 %Corson County34.8Bennett County: 32.9 %Bennett County32.9Dewey County: 32.3 %Dewey County32.3Hanson County: 32.2 %Hanson County32.2Jackson County: 31.9 %Jackson County31.9Hamlin County: 31.4 %Hamlin County31.4Mellette County: 30.9 %Mellette County30.9Lincoln County: 29.5 %Lincoln County29.5Charles Mix County: 29.5 %Charles Mix County29.5Lyman County: 29.2 %Lyman County29.2Roberts County: 27.8 %Roberts County27.8Beadle County: 26.4 %Beadle County26.4Aurora County: 26.4 %Aurora County26.4McCook County: 25.7 %McCook County25.7Meade County: 25.6 %Meade County25.6Moody County: 25.2 %Moody County25.2Minnehaha County: 25.2 %Minnehaha County25.2Union County: 24.7 %Union County24.7Brule County: 24.4 %Brule County24.4Codington County: 24.4 %Codington County24.4Butte County: 24.3 %Butte County24.3Clark County: 24.3 %Clark County24.3Harding County: 24.1 %Harding County24.1Hutchinson County: 24.1 %Hutchinson County24.1Turner County: 23.8 %Turner County23.8Edmunds County: 23.8 %Edmunds County23.8Hughes County: 23.7 %Hughes County23.7Spink County: 23.6 %Spink County23.6Pennington County: 23.6 %Pennington County23.6Stanley County: 23.6 %Stanley County23.6Jerauld County: 23.6 %Jerauld County23.6Brown County: 23.6 %Brown County23.6Deuel County: 23.2 %Deuel County23.2Sanborn County: 23.2 %Sanborn County23.2Davison County: 22.7 %Davison County22.7Walworth County: 22.7 %Walworth County22.7Todd County: 40.7 %Todd County40.7Buffalo County: 39.6 %Buffalo County39.6Oglala Lakota County: 38.3 %Oglala Lakota County38.3Ziebach County: 37.7 %Ziebach County37.7Corson County: 34.8 %Corson County34.8Bennett County: 32.9 %Bennett County32.9Dewey County: 32.3 %Dewey County32.3Hanson County: 32.2 %Hanson County32.2Jackson County: 31.9 %Jackson County31.9Hamlin County: 31.4 %Hamlin County31.4Mellette County: 30.9 %Mellette County30.9Lincoln County: 29.5 %Lincoln County29.5Charles Mix County: 29.5 %Charles Mix County29.5Lyman County: 29.2 %Lyman County29.2Roberts County: 27.8 %Roberts County27.8Beadle County: 26.4 %Beadle County26.4Aurora County: 26.4 %Aurora County26.4McCook County: 25.7 %McCook County25.7Meade County: 25.6 %Meade County25.6Moody County: 25.2 %Moody County25.2Minnehaha County: 25.2 %Minnehaha County25.2Union County: 24.7 %Union County24.7Brule County: 24.4 %Brule County24.4Codington County: 24.4 %Codington County24.4Butte County: 24.3 %Butte County24.3Clark County: 24.3 %Clark County24.3Harding County: 24.1 %Harding County24.1Hutchinson County: 24.1 %Hutchinson County24.1Turner County: 23.8 %Turner County23.8Edmunds County: 23.8 %Edmunds County23.8Hughes County: 23.7 %Hughes County23.7Spink County: 23.6 %Spink County23.6Pennington County: 23.6 %Pennington County23.6Stanley County: 23.6 %Stanley County23.6Jerauld County: 23.6 %Jerauld County23.6Brown County: 23.6 %Brown County23.6Deuel County: 23.2 %Deuel County23.2Sanborn County: 23.2 %Sanborn County23.2Davison County: 22.7 %Davison County22.7Walworth County: 22.7 %Walworth County22.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1Todd County40.7+0.4 pts
2Buffalo County39.6-0.6 pts
3Oglala Lakota County38.3+0.1 pts
4Ziebach County37.7-0.8 pts
5Corson County34.8+0.9 pts
6Bennett County32.9-0.5 pts
7Dewey County32.3-0.1 pts
8Hanson County32.2-0.2 pts
9Jackson County31.9-0.9 pts
10Hamlin County31.4-0.2 pts
11Mellette County30.9-0.6 pts
12Lincoln County29.5-0.1 pts
13Charles Mix County29.5+0.4 pts
14Lyman County29.2-0.2 pts
15Roberts County27.8-0.2 pts
16Beadle County26.4+0.7 pts
17Aurora County26.4+0.3 pts
18McCook County25.7-0.2 pts
19Meade County25.6+0.2 pts
20Moody County25.2+0.1 pts
21Minnehaha County25.2+0.1 pts
22Union County24.7-0.5 pts
23Brule County24.4-0.1 pts
24Codington County24.40 pts
25Butte County24.3-0.1 pts
26Clark County24.3+0.6 pts
27Harding County24.1+1.1 pts
28Hutchinson County24.1+0.5 pts
29Turner County23.8+0.1 pts
30Edmunds County23.8+0.7 pts
31Hughes County23.7+0.1 pts
32Spink County23.6-0.5 pts
33Pennington County23.6-0.2 pts
34Stanley County23.6-0.1 pts
35Jerauld County23.6+0.5 pts
36Brown County23.60 pts
37Deuel County23.2-0 pts
38Sanborn County23.2+0.8 pts
39Davison County22.7-0 pts
40Walworth County22.7-0.4 pts
41Tripp County22.6+0.3 pts
42Marshall County22.5+1 pts
43Douglas County22.5+1.2 pts
44Gregory County22.5-0.5 pts
45Miner County22.4-1.1 pts
46Grant County22.3-0.1 pts
47Day County22.3-0.1 pts
48Sully County22.3-0.3 pts
49Kingsbury County22.2+0.2 pts
50Haakon County21.8-0.6 pts
51Perkins County21.5-0.4 pts
52Faulk County21.4-0.1 pts
53Lake County21.3+0.3 pts
54Hand County21.3+0.1 pts
54Yankton County21.3+0.1 pts
56Hyde County21.3+0.5 pts
57Jones County20.9-0.5 pts
58McPherson County20.6+0.1 pts
59Brookings County20.3+0.4 pts
60Potter County20.1+0.1 pts
61Lawrence County19.10 pts
62Campbell County18.7+0.9 pts
63Bon Homme County18.6-0.1 pts
64Fall River County18.5+0.4 pts
65Custer County17.4-0.5 pts
66Clay County17.3-0.5 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, 2015) [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, 2015. 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=2015. 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, 2015. 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=2015.

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, 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2015,
  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, 2015}},
  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=2015. 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, 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-under-18/south-dakota-counties?period=2015.
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 40.7% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population under 18?

Clay County, with 17.3% in 2015.

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