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 2018, at 70.3%. Jerauld County had the lowest, at 46.5%. The median was 54.9% and the figure for South Dakota was 58.6%. Source: the U.S. Census Bureau.

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Highest70.3Clay County
Lowest46.5Jerauld County
Median54.966 counties
South Dakota58.6History

Map of counties, 2018

Aurora County: 53.4 %Beadle County: 55.7 %Bennett County: 53.2 %Bon Homme County: 59.7 %Brookings County: 66.8 %Brown County: 59.1 %Brule County: 55.8 %Buffalo County: 51.3 %Butte County: 56.1 %Campbell County: 54.8 %Charles Mix County: 53.4 %Clark County: 53.7 %Clay County: 70.3 %Codington County: 58.7 %Corson County: 52.5 %Custer County: 52.4 %Davison County: 58.7 %Day County: 51.7 %Deuel County: 56 %Dewey County: 56.3 %Douglas County: 50.2 %Edmunds County: 55 %Fall River County: 52.5 %Faulk County: 52.6 %Grant County: 55.2 %Gregory County: 50.7 %Haakon County: 53.6 %Hamlin County: 51 %Hand County: 53 %Hanson County: 53.2 %Harding County: 57.8 %Hughes County: 59.2 %Hutchinson County: 51.9 %Hyde County: 55.8 %Jackson County: 54.2 %Jerauld County: 46.5 %Jones County: 55.4 %Kingsbury County: 53.6 %Lake County: 59.8 %Lawrence County: 59.1 %Lincoln County: 59.1 %Lyman County: 54.9 %McCook County: 54.5 %McPherson County: 49.8 %Marshall County: 55.1 %Meade County: 59.4 %Mellette County: 52.2 %Miner County: 53.4 %Minnehaha County: 61 %Moody County: 54.6 %Oglala Lakota County: 55.7 %Pennington County: 59.8 %Perkins County: 54.3 %Potter County: 50.2 %Roberts County: 51.8 %Sanborn County: 54.9 %Spink County: 56.1 %Stanley County: 55.9 %Sully County: 57.4 %Todd County: 51.8 %Tripp County: 55.1 %Turner County: 54.3 %Union County: 57 %Walworth County: 53.5 %Yankton County: 59.7 %Ziebach County: 55.5 %
  • Under 52
  • 52 to 53
  • 53 to 55
  • 55 to 56
  • 56 to 59
  • 59 and over
%, 2018. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2018

Clay County: 70.3 %Clay County70.3Brookings County: 66.8 %Brookings County66.8Minnehaha County: 61 %Minnehaha County61Lake County: 59.8 %Lake County59.8Pennington County: 59.8 %Pennington County59.8Yankton County: 59.7 %Yankton County59.7Bon Homme County: 59.7 %Bon Homme County59.7Meade County: 59.4 %Meade County59.4Hughes County: 59.2 %Hughes County59.2Brown County: 59.1 %Brown County59.1Lawrence County: 59.1 %Lawrence County59.1Lincoln County: 59.1 %Lincoln County59.1Codington County: 58.7 %Codington County58.7Davison County: 58.7 %Davison County58.7Harding County: 57.8 %Harding County57.8Sully County: 57.4 %Sully County57.4Union County: 57 %Union County57Dewey County: 56.3 %Dewey County56.3Spink County: 56.1 %Spink County56.1Butte County: 56.1 %Butte County56.1Deuel County: 56 %Deuel County56Stanley County: 55.9 %Stanley County55.9Hyde County: 55.8 %Hyde County55.8Brule County: 55.8 %Brule County55.8Oglala Lakota County: 55.7 %Oglala Lakota County55.7Beadle County: 55.7 %Beadle County55.7Ziebach County: 55.5 %Ziebach County55.5Jones County: 55.4 %Jones County55.4Grant County: 55.2 %Grant County55.2Tripp County: 55.1 %Tripp County55.1Marshall County: 55.1 %Marshall County55.1Edmunds County: 55 %Edmunds County55Lyman County: 54.9 %Lyman County54.9Sanborn County: 54.9 %Sanborn County54.9Campbell County: 54.8 %Campbell County54.8Moody County: 54.6 %Moody County54.6McCook County: 54.5 %McCook County54.5Turner County: 54.3 %Turner County54.3Perkins County: 54.3 %Perkins County54.3Jackson County: 54.2 %Jackson County54.2Clay County: 70.3 %Clay County70.3Brookings County: 66.8 %Brookings County66.8Minnehaha County: 61 %Minnehaha County61Lake County: 59.8 %Lake County59.8Pennington County: 59.8 %Pennington County59.8Yankton County: 59.7 %Yankton County59.7Bon Homme County: 59.7 %Bon Homme County59.7Meade County: 59.4 %Meade County59.4Hughes County: 59.2 %Hughes County59.2Brown County: 59.1 %Brown County59.1Lawrence County: 59.1 %Lawrence County59.1Lincoln County: 59.1 %Lincoln County59.1Codington County: 58.7 %Codington County58.7Davison County: 58.7 %Davison County58.7Harding County: 57.8 %Harding County57.8Sully County: 57.4 %Sully County57.4Union County: 57 %Union County57Dewey County: 56.3 %Dewey County56.3Spink County: 56.1 %Spink County56.1Butte County: 56.1 %Butte County56.1Deuel County: 56 %Deuel County56Stanley County: 55.9 %Stanley County55.9Hyde County: 55.8 %Hyde County55.8Brule County: 55.8 %Brule County55.8Oglala Lakota County: 55.7 %Oglala Lakota County55.7Beadle County: 55.7 %Beadle County55.7Ziebach County: 55.5 %Ziebach County55.5Jones County: 55.4 %Jones County55.4Grant County: 55.2 %Grant County55.2Tripp County: 55.1 %Tripp County55.1Marshall County: 55.1 %Marshall County55.1Edmunds County: 55 %Edmunds County55Lyman County: 54.9 %Lyman County54.9Sanborn County: 54.9 %Sanborn County54.9Campbell County: 54.8 %Campbell County54.8Moody County: 54.6 %Moody County54.6McCook County: 54.5 %McCook County54.5Turner County: 54.3 %Turner County54.3Perkins County: 54.3 %Perkins County54.3Jackson County: 54.2 %Jackson County54.2
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2018 (%)Change on 2017
1Clay County70.3-0.1 pts
2Brookings County66.8-0.8 pts
3Minnehaha County61-0.4 pts
4Lake County59.8-0.6 pts
5Pennington County59.8-0.4 pts
6Yankton County59.7-0.3 pts
7Bon Homme County59.7-0.6 pts
8Meade County59.4-0.5 pts
9Hughes County59.2-0.5 pts
10Brown County59.1-0.3 pts
11Lawrence County59.1-1 pts
12Lincoln County59.1-0.2 pts
13Codington County58.7-0.3 pts
14Davison County58.7-0.4 pts
15Harding County57.8-1.3 pts
16Sully County57.4-0.2 pts
17Union County57-0.4 pts
18Dewey County56.3-0.5 pts
19Spink County56.1-0.5 pts
20Butte County56.1-0.3 pts
21Deuel County56+0.4 pts
22Stanley County55.9-0 pts
23Hyde County55.8+0.8 pts
24Brule County55.8+0.3 pts
25Oglala Lakota County55.7+0.4 pts
26Beadle County55.7-0.4 pts
27Ziebach County55.5-0.1 pts
28Jones County55.4-0.4 pts
29Grant County55.2-0.4 pts
30Tripp County55.1-0.2 pts
31Marshall County55.1-0.7 pts
32Edmunds County55-0.3 pts
33Lyman County54.9-0.3 pts
34Sanborn County54.9-0.7 pts
35Campbell County54.8-1.4 pts
36Moody County54.6-0.7 pts
37McCook County54.5-0.4 pts
38Turner County54.3-0.7 pts
39Perkins County54.3-0.1 pts
40Jackson County54.2+0.1 pts
41Clark County53.7-0.2 pts
42Kingsbury County53.6-0.8 pts
43Haakon County53.6-0.1 pts
44Walworth County53.50 pts
45Miner County53.4-0.6 pts
46Charles Mix County53.4-0.1 pts
47Aurora County53.4+0.9 pts
48Bennett County53.2-1 pts
49Hanson County53.2-0.2 pts
50Hand County53-0.5 pts
51Faulk County52.6-0.5 pts
52Corson County52.5-0.7 pts
53Fall River County52.5-0.4 pts
54Custer County52.4-1.5 pts
55Mellette County52.2-0.3 pts
56Hutchinson County51.9-0.3 pts
57Todd County51.8+0.2 pts
58Roberts County51.8-0.9 pts
59Day County51.7-0.6 pts
60Buffalo County51.3-0.9 pts
61Hamlin County51-0.3 pts
62Gregory County50.7-1.4 pts
63Douglas County50.2-0.7 pts
64Potter County50.2-0 pts
65McPherson County49.8-1 pts
66Jerauld County46.5-2.1 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, 2018) [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, 2018. 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=2018. 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, 2018. 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=2018.

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, 2018 [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=2018 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2018,
  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, 2018}},
  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=2018. 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, 2018
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=2018
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2018.
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 70.3% in 2018, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jerauld County, with 46.5% in 2018.

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