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 2020, at 69.7%. Jerauld County had the lowest, at 46.7%. The median was 53.3% and the figure for South Dakota was 57.6%. Source: the U.S. Census Bureau.

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Highest69.7Clay County
Lowest46.7Jerauld County
Median53.366 counties
South Dakota57.6History

Map of counties, 2020

Aurora County: 52.2 %Beadle County: 54.5 %Bennett County: 53.2 %Bon Homme County: 60.2 %Brookings County: 65.3 %Brown County: 58 %Brule County: 54.7 %Buffalo County: 51.2 %Butte County: 53.9 %Campbell County: 53.1 %Charles Mix County: 52.6 %Clark County: 51.3 %Clay County: 69.7 %Codington County: 57.8 %Corson County: 52.5 %Custer County: 50.5 %Davison County: 57 %Day County: 50.6 %Deuel County: 54.6 %Dewey County: 54.1 %Douglas County: 49.6 %Edmunds County: 54.5 %Fall River County: 50.5 %Faulk County: 50 %Grant County: 53.8 %Gregory County: 49.7 %Haakon County: 53.2 %Hamlin County: 49.7 %Hand County: 52 %Hanson County: 53.3 %Harding County: 56 %Hughes County: 57.9 %Hutchinson County: 50.7 %Hyde County: 53 %Jackson County: 51.1 %Jerauld County: 46.7 %Jones County: 51.7 %Kingsbury County: 52.7 %Lake County: 58 %Lawrence County: 57.7 %Lincoln County: 58.9 %Lyman County: 54.6 %McCook County: 53.7 %McPherson County: 50.8 %Marshall County: 51.7 %Meade County: 59.8 %Mellette County: 51.5 %Miner County: 52 %Minnehaha County: 60.2 %Moody County: 53.2 %Oglala Lakota County: 55.1 %Pennington County: 58.5 %Perkins County: 52 %Potter County: 49.5 %Roberts County: 50.6 %Sanborn County: 54.7 %Spink County: 54.2 %Stanley County: 53.9 %Sully County: 57 %Todd County: 51.1 %Tripp County: 54 %Turner County: 53 %Union County: 56.4 %Walworth County: 52.2 %Yankton County: 58.4 %Ziebach County: 57.4 %
  • Under 51
  • 51 to 52
  • 52 to 53
  • 53 to 55
  • 55 to 58
  • 58 and over
%, 2020. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2020

Clay County: 69.7 %Clay County69.7Brookings County: 65.3 %Brookings County65.3Bon Homme County: 60.2 %Bon Homme County60.2Minnehaha County: 60.2 %Minnehaha County60.2Meade County: 59.8 %Meade County59.8Lincoln County: 58.9 %Lincoln County58.9Pennington County: 58.5 %Pennington County58.5Yankton County: 58.4 %Yankton County58.4Brown County: 58 %Brown County58Lake County: 58 %Lake County58Hughes County: 57.9 %Hughes County57.9Codington County: 57.8 %Codington County57.8Lawrence County: 57.7 %Lawrence County57.7Ziebach County: 57.4 %Ziebach County57.4Davison County: 57 %Davison County57Sully County: 57 %Sully County57Union County: 56.4 %Union County56.4Harding County: 56 %Harding County56Oglala Lakota County: 55.1 %Oglala Lakota County55.1Brule County: 54.7 %Brule County54.7Sanborn County: 54.7 %Sanborn County54.7Deuel County: 54.6 %Deuel County54.6Lyman County: 54.6 %Lyman County54.6Beadle County: 54.5 %Beadle County54.5Edmunds County: 54.5 %Edmunds County54.5Spink County: 54.2 %Spink County54.2Dewey County: 54.1 %Dewey County54.1Tripp County: 54 %Tripp County54Stanley County: 53.9 %Stanley County53.9Butte County: 53.9 %Butte County53.9Grant County: 53.8 %Grant County53.8McCook County: 53.7 %McCook County53.7Hanson County: 53.3 %Hanson County53.3Haakon County: 53.2 %Haakon County53.2Moody County: 53.2 %Moody County53.2Bennett County: 53.2 %Bennett County53.2Campbell County: 53.1 %Campbell County53.1Hyde County: 53 %Hyde County53Turner County: 53 %Turner County53Kingsbury County: 52.7 %Kingsbury County52.7Clay County: 69.7 %Clay County69.7Brookings County: 65.3 %Brookings County65.3Bon Homme County: 60.2 %Bon Homme County60.2Minnehaha County: 60.2 %Minnehaha County60.2Meade County: 59.8 %Meade County59.8Lincoln County: 58.9 %Lincoln County58.9Pennington County: 58.5 %Pennington County58.5Yankton County: 58.4 %Yankton County58.4Brown County: 58 %Brown County58Lake County: 58 %Lake County58Hughes County: 57.9 %Hughes County57.9Codington County: 57.8 %Codington County57.8Lawrence County: 57.7 %Lawrence County57.7Ziebach County: 57.4 %Ziebach County57.4Davison County: 57 %Davison County57Sully County: 57 %Sully County57Union County: 56.4 %Union County56.4Harding County: 56 %Harding County56Oglala Lakota County: 55.1 %Oglala Lakota County55.1Brule County: 54.7 %Brule County54.7Sanborn County: 54.7 %Sanborn County54.7Deuel County: 54.6 %Deuel County54.6Lyman County: 54.6 %Lyman County54.6Beadle County: 54.5 %Beadle County54.5Edmunds County: 54.5 %Edmunds County54.5Spink County: 54.2 %Spink County54.2Dewey County: 54.1 %Dewey County54.1Tripp County: 54 %Tripp County54Stanley County: 53.9 %Stanley County53.9Butte County: 53.9 %Butte County53.9Grant County: 53.8 %Grant County53.8McCook County: 53.7 %McCook County53.7Hanson County: 53.3 %Hanson County53.3Haakon County: 53.2 %Haakon County53.2Moody County: 53.2 %Moody County53.2Bennett County: 53.2 %Bennett County53.2Campbell County: 53.1 %Campbell County53.1Hyde County: 53 %Hyde County53Turner County: 53 %Turner County53Kingsbury County: 52.7 %Kingsbury County52.7
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2020 (%)Change on 2019
1Clay County69.7-0.3 pts
2Brookings County65.3-0.8 pts
3Bon Homme County60.2+0.6 pts
4Minnehaha County60.2-0.5 pts
5Meade County59.8+0.9 pts
6Lincoln County58.90 pts
7Pennington County58.5-0.9 pts
8Yankton County58.4-0.8 pts
9Brown County58-0.7 pts
10Lake County58-0.4 pts
11Hughes County57.9-0.8 pts
12Codington County57.8-0.5 pts
13Lawrence County57.7-0.6 pts
14Ziebach County57.4+2.5 pts
15Davison County57-1.1 pts
16Sully County57+0.3 pts
17Union County56.4-0.3 pts
18Harding County56-1.1 pts
19Oglala Lakota County55.1-0.9 pts
20Brule County54.7-0.9 pts
21Sanborn County54.7+0.7 pts
22Deuel County54.6-1 pts
23Lyman County54.6+0.1 pts
24Beadle County54.5-0.8 pts
25Edmunds County54.5+0.1 pts
26Spink County54.2-1.1 pts
27Dewey County54.1-2.4 pts
28Tripp County54-0.6 pts
29Stanley County53.9-1.1 pts
30Butte County53.9-1.3 pts
31Grant County53.8-0.4 pts
32McCook County53.7-0.9 pts
33Hanson County53.3+0.4 pts
34Haakon County53.2-0.6 pts
35Moody County53.2-0.8 pts
36Bennett County53.2+0.3 pts
37Campbell County53.1-0.1 pts
38Hyde County53-2.7 pts
39Turner County53-0.9 pts
40Kingsbury County52.7-0.2 pts
41Charles Mix County52.6-0.6 pts
42Corson County52.5+0.2 pts
43Aurora County52.2-0.6 pts
44Walworth County52.2-0.6 pts
45Hand County52-0.7 pts
46Miner County52-1.2 pts
47Perkins County52-0.7 pts
48Marshall County51.7-2.2 pts
49Jones County51.7-3.8 pts
50Mellette County51.5+0.2 pts
51Clark County51.3-0.7 pts
52Buffalo County51.2-0.4 pts
53Todd County51.1-0.9 pts
54Jackson County51.1-1.6 pts
55McPherson County50.8+0.9 pts
56Hutchinson County50.7-0.7 pts
57Day County50.6-0.6 pts
58Roberts County50.6-0.7 pts
59Fall River County50.5-0.9 pts
60Custer County50.5-0.4 pts
61Faulk County50-0.5 pts
62Gregory County49.7-0.5 pts
63Hamlin County49.7-0.5 pts
64Douglas County49.6-0.8 pts
65Potter County49.5-1.1 pts
66Jerauld County46.7+0.3 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, 2020) [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, 2020. 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=2020. 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, 2020. 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=2020.

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, 2020 [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=2020 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2020,
  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, 2020}},
  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=2020. 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, 2020
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=2020
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2020.
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 69.7% in 2020, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jerauld County, with 46.7% in 2020.

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