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 2021, at 69.4%. Jerauld County had the lowest, at 46.5%. The median was 53.5% and the figure for South Dakota was 57.5%. Source: the U.S. Census Bureau.

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Highest69.4Clay County
Lowest46.5Jerauld County
Median53.566 counties
South Dakota57.5History

Map of counties, 2021

Aurora County: 52.5 %Beadle County: 54.3 %Bennett County: 54.2 %Bon Homme County: 59.8 %Brookings County: 64.7 %Brown County: 58 %Brule County: 54.5 %Buffalo County: 52 %Butte County: 53.7 %Campbell County: 52.4 %Charles Mix County: 52.8 %Clark County: 50.4 %Clay County: 69.4 %Codington County: 57.7 %Corson County: 52 %Custer County: 50 %Davison County: 56.7 %Day County: 51 %Deuel County: 53.7 %Dewey County: 53.7 %Douglas County: 49 %Edmunds County: 54.1 %Fall River County: 50.5 %Faulk County: 50.1 %Grant County: 53.5 %Gregory County: 49 %Haakon County: 52.9 %Hamlin County: 49.6 %Hand County: 51.4 %Hanson County: 54.1 %Harding County: 54.9 %Hughes County: 57.5 %Hutchinson County: 50.7 %Hyde County: 51.6 %Jackson County: 50.5 %Jerauld County: 46.5 %Jones County: 51 %Kingsbury County: 51.6 %Lake County: 57.9 %Lawrence County: 57.3 %Lincoln County: 58.9 %Lyman County: 54.9 %McCook County: 53.4 %McPherson County: 50.9 %Marshall County: 50.6 %Meade County: 59.7 %Mellette County: 50.3 %Miner County: 51.8 %Minnehaha County: 60.2 %Moody County: 53 %Oglala Lakota County: 55.2 %Pennington County: 58.5 %Perkins County: 51.8 %Potter County: 49.5 %Roberts County: 50.4 %Sanborn County: 53.9 %Spink County: 53.8 %Stanley County: 53.7 %Sully County: 56 %Todd County: 51 %Tripp County: 53.7 %Turner County: 53.1 %Union County: 56.3 %Walworth County: 52.7 %Yankton County: 57.7 %Ziebach County: 57.3 %
  • Under 51
  • 51 to 52
  • 52 to 53
  • 53 to 54
  • 54 to 58
  • 58 and over
%, 2021. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2021

Clay County: 69.4 %Clay County69.4Brookings County: 64.7 %Brookings County64.7Minnehaha County: 60.2 %Minnehaha County60.2Bon Homme County: 59.8 %Bon Homme County59.8Meade County: 59.7 %Meade County59.7Lincoln County: 58.9 %Lincoln County58.9Pennington County: 58.5 %Pennington County58.5Brown County: 58 %Brown County58Lake County: 57.9 %Lake County57.9Yankton County: 57.7 %Yankton County57.7Codington County: 57.7 %Codington County57.7Hughes County: 57.5 %Hughes County57.5Lawrence County: 57.3 %Lawrence County57.3Ziebach County: 57.3 %Ziebach County57.3Davison County: 56.7 %Davison County56.7Union County: 56.3 %Union County56.3Sully County: 56 %Sully County56Oglala Lakota County: 55.2 %Oglala Lakota County55.2Lyman County: 54.9 %Lyman County54.9Harding County: 54.9 %Harding County54.9Brule County: 54.5 %Brule County54.5Beadle County: 54.3 %Beadle County54.3Bennett County: 54.2 %Bennett County54.2Edmunds County: 54.1 %Edmunds County54.1Hanson County: 54.1 %Hanson County54.1Sanborn County: 53.9 %Sanborn County53.9Spink County: 53.8 %Spink County53.8Butte County: 53.7 %Butte County53.7Stanley County: 53.7 %Stanley County53.7Dewey County: 53.7 %Dewey County53.7Deuel County: 53.7 %Deuel County53.7Tripp County: 53.7 %Tripp County53.7Grant County: 53.5 %Grant County53.5McCook County: 53.4 %McCook County53.4Turner County: 53.1 %Turner County53.1Moody County: 53 %Moody County53Haakon County: 52.9 %Haakon County52.9Charles Mix County: 52.8 %Charles Mix County52.8Walworth County: 52.7 %Walworth County52.7Aurora County: 52.5 %Aurora County52.5Clay County: 69.4 %Clay County69.4Brookings County: 64.7 %Brookings County64.7Minnehaha County: 60.2 %Minnehaha County60.2Bon Homme County: 59.8 %Bon Homme County59.8Meade County: 59.7 %Meade County59.7Lincoln County: 58.9 %Lincoln County58.9Pennington County: 58.5 %Pennington County58.5Brown County: 58 %Brown County58Lake County: 57.9 %Lake County57.9Yankton County: 57.7 %Yankton County57.7Codington County: 57.7 %Codington County57.7Hughes County: 57.5 %Hughes County57.5Lawrence County: 57.3 %Lawrence County57.3Ziebach County: 57.3 %Ziebach County57.3Davison County: 56.7 %Davison County56.7Union County: 56.3 %Union County56.3Sully County: 56 %Sully County56Oglala Lakota County: 55.2 %Oglala Lakota County55.2Lyman County: 54.9 %Lyman County54.9Harding County: 54.9 %Harding County54.9Brule County: 54.5 %Brule County54.5Beadle County: 54.3 %Beadle County54.3Bennett County: 54.2 %Bennett County54.2Edmunds County: 54.1 %Edmunds County54.1Hanson County: 54.1 %Hanson County54.1Sanborn County: 53.9 %Sanborn County53.9Spink County: 53.8 %Spink County53.8Butte County: 53.7 %Butte County53.7Stanley County: 53.7 %Stanley County53.7Dewey County: 53.7 %Dewey County53.7Deuel County: 53.7 %Deuel County53.7Tripp County: 53.7 %Tripp County53.7Grant County: 53.5 %Grant County53.5McCook County: 53.4 %McCook County53.4Turner County: 53.1 %Turner County53.1Moody County: 53 %Moody County53Haakon County: 52.9 %Haakon County52.9Charles Mix County: 52.8 %Charles Mix County52.8Walworth County: 52.7 %Walworth County52.7Aurora County: 52.5 %Aurora County52.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2021 (%)Change on 2020
1Clay County69.4-0.3 pts
2Brookings County64.7-0.6 pts
3Minnehaha County60.20 pts
4Bon Homme County59.8-0.4 pts
5Meade County59.7-0.1 pts
6Lincoln County58.90 pts
7Pennington County58.5+0.1 pts
8Brown County58-0.1 pts
9Lake County57.9-0.1 pts
10Yankton County57.7-0.7 pts
11Codington County57.7-0.2 pts
12Hughes County57.5-0.4 pts
13Lawrence County57.3-0.4 pts
14Ziebach County57.3-0.1 pts
15Davison County56.7-0.3 pts
16Union County56.3-0.1 pts
17Sully County56-1 pts
18Oglala Lakota County55.2+0.2 pts
19Lyman County54.9+0.3 pts
20Harding County54.9-1.1 pts
21Brule County54.5-0.2 pts
22Beadle County54.3-0.2 pts
23Bennett County54.2+1 pts
24Edmunds County54.1-0.4 pts
25Hanson County54.1+0.8 pts
26Sanborn County53.9-0.8 pts
27Spink County53.8-0.4 pts
28Butte County53.7-0.2 pts
29Stanley County53.7-0.2 pts
30Dewey County53.7-0.3 pts
31Deuel County53.7-0.9 pts
32Tripp County53.7-0.3 pts
33Grant County53.5-0.3 pts
34McCook County53.4-0.3 pts
35Turner County53.1+0.1 pts
36Moody County53-0.2 pts
37Haakon County52.9-0.4 pts
38Charles Mix County52.8+0.2 pts
39Walworth County52.7+0.5 pts
40Aurora County52.5+0.3 pts
41Campbell County52.4-0.7 pts
42Corson County52-0.5 pts
43Buffalo County52+0.8 pts
44Miner County51.8-0.2 pts
45Perkins County51.8-0.2 pts
46Hyde County51.6-1.4 pts
47Kingsbury County51.6-1 pts
48Hand County51.4-0.6 pts
49Jones County51-0.6 pts
50Day County51+0.4 pts
51Todd County51-0.2 pts
52McPherson County50.9+0.1 pts
53Hutchinson County50.7-0.1 pts
54Marshall County50.6-1.1 pts
55Jackson County50.5-0.6 pts
56Fall River County50.5-0 pts
57Roberts County50.4-0.2 pts
58Clark County50.4-0.9 pts
59Mellette County50.3-1.2 pts
60Faulk County50.1+0.1 pts
61Custer County50-0.5 pts
62Hamlin County49.6-0.1 pts
63Potter County49.50 pts
64Douglas County49-0.6 pts
65Gregory County49-0.7 pts
66Jerauld County46.5-0.2 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, 2021) [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, 2021. 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=2021. 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, 2021. 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=2021.

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, 2021 [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=2021 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2021,
  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, 2021}},
  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=2021. 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, 2021
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=2021
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2021.
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 69.4% in 2021, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jerauld County, with 46.5% in 2021.

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