Data / Rankings / Population aged 18 to 64 / Counties in South Dakota

Counties in South Dakota by population aged 18 to 64

Clay County had the highest population aged 18 to 64 of 66 counties in 2019, at 69.9%. Jerauld County had the lowest, at 46.4%. The median was 54.1% and the figure for South Dakota was 58.2%. Source: the U.S. Census Bureau.

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Highest69.9Clay County
Lowest46.4Jerauld County
Median54.166 counties
South Dakota58.2History

Map of counties, 2019

Aurora County: 52.9 %Beadle County: 55.3 %Bennett County: 52.8 %Bon Homme County: 59.7 %Brookings County: 66.1 %Brown County: 58.7 %Brule County: 55.6 %Buffalo County: 51.7 %Butte County: 55.2 %Campbell County: 53.2 %Charles Mix County: 53.2 %Clark County: 52 %Clay County: 69.9 %Codington County: 58.4 %Corson County: 52.3 %Custer County: 50.9 %Davison County: 58.2 %Day County: 51.2 %Deuel County: 55.7 %Dewey County: 56.5 %Douglas County: 50.5 %Edmunds County: 54.4 %Fall River County: 51.4 %Faulk County: 50.5 %Grant County: 54.2 %Gregory County: 50.2 %Haakon County: 53.8 %Hamlin County: 50.2 %Hand County: 52.7 %Hanson County: 52.9 %Harding County: 57.2 %Hughes County: 58.6 %Hutchinson County: 51.4 %Hyde County: 55.7 %Jackson County: 52.7 %Jerauld County: 46.4 %Jones County: 55.5 %Kingsbury County: 52.8 %Lake County: 58.4 %Lawrence County: 58.3 %Lincoln County: 58.8 %Lyman County: 54.5 %McCook County: 54.7 %McPherson County: 49.9 %Marshall County: 54 %Meade County: 58.9 %Mellette County: 51.3 %Miner County: 53.2 %Minnehaha County: 60.7 %Moody County: 54 %Oglala Lakota County: 56 %Pennington County: 59.4 %Perkins County: 52.7 %Potter County: 50.6 %Roberts County: 51.3 %Sanborn County: 54 %Spink County: 55.4 %Stanley County: 55 %Sully County: 56.7 %Todd County: 52 %Tripp County: 54.5 %Turner County: 53.9 %Union County: 56.7 %Walworth County: 52.8 %Yankton County: 59.2 %Ziebach County: 54.9 %
  • Under 51
  • 51 to 53
  • 53 to 54
  • 54 to 56
  • 56 to 58
  • 58 and over
%, 2019. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2019

Clay County: 69.9 %Clay County69.9Brookings County: 66.1 %Brookings County66.1Minnehaha County: 60.7 %Minnehaha County60.7Bon Homme County: 59.7 %Bon Homme County59.7Pennington County: 59.4 %Pennington County59.4Yankton County: 59.2 %Yankton County59.2Meade County: 58.9 %Meade County58.9Lincoln County: 58.8 %Lincoln County58.8Brown County: 58.7 %Brown County58.7Hughes County: 58.6 %Hughes County58.6Lake County: 58.4 %Lake County58.4Codington County: 58.4 %Codington County58.4Lawrence County: 58.3 %Lawrence County58.3Davison County: 58.2 %Davison County58.2Harding County: 57.2 %Harding County57.2Union County: 56.7 %Union County56.7Sully County: 56.7 %Sully County56.7Dewey County: 56.5 %Dewey County56.5Oglala Lakota County: 56 %Oglala Lakota County56Hyde County: 55.7 %Hyde County55.7Deuel County: 55.7 %Deuel County55.7Brule County: 55.6 %Brule County55.6Jones County: 55.5 %Jones County55.5Spink County: 55.4 %Spink County55.4Beadle County: 55.3 %Beadle County55.3Butte County: 55.2 %Butte County55.2Stanley County: 55 %Stanley County55Ziebach County: 54.9 %Ziebach County54.9McCook County: 54.7 %McCook County54.7Tripp County: 54.5 %Tripp County54.5Lyman County: 54.5 %Lyman County54.5Edmunds County: 54.4 %Edmunds County54.4Grant County: 54.2 %Grant County54.2Moody County: 54 %Moody County54Sanborn County: 54 %Sanborn County54Marshall County: 54 %Marshall County54Turner County: 53.9 %Turner County53.9Haakon County: 53.8 %Haakon County53.8Campbell County: 53.2 %Campbell County53.2Miner County: 53.2 %Miner County53.2Clay County: 69.9 %Clay County69.9Brookings County: 66.1 %Brookings County66.1Minnehaha County: 60.7 %Minnehaha County60.7Bon Homme County: 59.7 %Bon Homme County59.7Pennington County: 59.4 %Pennington County59.4Yankton County: 59.2 %Yankton County59.2Meade County: 58.9 %Meade County58.9Lincoln County: 58.8 %Lincoln County58.8Brown County: 58.7 %Brown County58.7Hughes County: 58.6 %Hughes County58.6Lake County: 58.4 %Lake County58.4Codington County: 58.4 %Codington County58.4Lawrence County: 58.3 %Lawrence County58.3Davison County: 58.2 %Davison County58.2Harding County: 57.2 %Harding County57.2Union County: 56.7 %Union County56.7Sully County: 56.7 %Sully County56.7Dewey County: 56.5 %Dewey County56.5Oglala Lakota County: 56 %Oglala Lakota County56Hyde County: 55.7 %Hyde County55.7Deuel County: 55.7 %Deuel County55.7Brule County: 55.6 %Brule County55.6Jones County: 55.5 %Jones County55.5Spink County: 55.4 %Spink County55.4Beadle County: 55.3 %Beadle County55.3Butte County: 55.2 %Butte County55.2Stanley County: 55 %Stanley County55Ziebach County: 54.9 %Ziebach County54.9McCook County: 54.7 %McCook County54.7Tripp County: 54.5 %Tripp County54.5Lyman County: 54.5 %Lyman County54.5Edmunds County: 54.4 %Edmunds County54.4Grant County: 54.2 %Grant County54.2Moody County: 54 %Moody County54Sanborn County: 54 %Sanborn County54Marshall County: 54 %Marshall County54Turner County: 53.9 %Turner County53.9Haakon County: 53.8 %Haakon County53.8Campbell County: 53.2 %Campbell County53.2Miner County: 53.2 %Miner County53.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2019 (%)Change on 2018
1Clay County69.9-0.3 pts
2Brookings County66.1-0.7 pts
3Minnehaha County60.7-0.3 pts
4Bon Homme County59.7-0 pts
5Pennington County59.4-0.4 pts
6Yankton County59.2-0.5 pts
7Meade County58.9-0.5 pts
8Lincoln County58.8-0.2 pts
9Brown County58.7-0.3 pts
10Hughes County58.6-0.6 pts
11Lake County58.4-1.4 pts
12Codington County58.4-0.3 pts
13Lawrence County58.3-0.8 pts
14Davison County58.2-0.5 pts
15Harding County57.2-0.6 pts
16Union County56.7-0.4 pts
17Sully County56.7-0.8 pts
18Dewey County56.5+0.3 pts
19Oglala Lakota County56+0.3 pts
20Hyde County55.7-0.1 pts
21Deuel County55.7-0.3 pts
22Brule County55.6-0.2 pts
23Jones County55.50 pts
24Spink County55.4-0.7 pts
25Beadle County55.3-0.4 pts
26Butte County55.2-0.9 pts
27Stanley County55-0.9 pts
28Ziebach County54.9-0.6 pts
29McCook County54.7+0.2 pts
30Tripp County54.5-0.6 pts
31Lyman County54.5-0.4 pts
32Edmunds County54.4-0.6 pts
33Grant County54.2-1 pts
34Moody County54-0.6 pts
35Sanborn County54-0.9 pts
36Marshall County54-1.1 pts
37Turner County53.9-0.5 pts
38Haakon County53.8+0.2 pts
39Campbell County53.2-1.5 pts
40Miner County53.2-0.2 pts
41Charles Mix County53.2-0.1 pts
42Hanson County52.9-0.2 pts
43Aurora County52.9-0.5 pts
44Walworth County52.8-0.6 pts
45Bennett County52.8-0.4 pts
46Kingsbury County52.8-0.8 pts
47Jackson County52.7-1.5 pts
48Hand County52.7-0.3 pts
48Perkins County52.7-1.6 pts
50Corson County52.3-0.3 pts
51Todd County52+0.2 pts
52Clark County52-1.7 pts
53Buffalo County51.7+0.4 pts
54Hutchinson County51.4-0.4 pts
55Fall River County51.4-1.1 pts
56Roberts County51.3-0.5 pts
57Mellette County51.3-0.9 pts
58Day County51.2-0.5 pts
59Custer County50.9-1.5 pts
60Potter County50.6+0.4 pts
61Faulk County50.5-2 pts
62Douglas County50.5+0.2 pts
63Gregory County50.2-0.5 pts
64Hamlin County50.2-0.9 pts
65McPherson County49.9+0.1 pts
66Jerauld County46.4-0 pts

Other periods

About this ranking

Residents aged 18 to 64 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.

Not comparable with working-age shares for ages 15 to 64 used in EU and World Bank statistics.

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 18 to 64 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 18 to 64 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 aged 18 to 64, 2019) [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 18 to 64 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 aged 18 to 64, 2019. U.S. Census Bureau, 25 June 2026, https://www.census.gov/programs-surveys/popest/data/data-sets.html. Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2019. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Census Bureau. 2026. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64, 2019. 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-18-64/south-dakota-counties?period=2019.

Harvard

U.S. Census Bureau (2026) Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64, 2019 [Dataset]. Available at: https://www.census.gov/programs-surveys/popest/data/data-sets.html, via Invokely: https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2019 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2019,
  author = {{U.S. Census Bureau}},
  title = {{Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64, 2019}},
  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-18-64/south-dakota-counties?period=2019. Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 18 to 64 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 aged 18 to 64, 2019
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-18-64/south-dakota-counties?period=2019
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2019.
N1  - Publisher attribution: U.S. Census Bureau. Population Estimates Program, county population by age and sex: residents aged 18 to 64 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 aged 18 to 64?

Clay County, with 69.9% in 2019, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jerauld County, with 46.4% in 2019.

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 18 to 64 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 aged 18 to 64: other rankings

Counties in South Dakota: more rankings