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 2015, at 70.9%. Jerauld County had the lowest, at 48.6%. The median was 55.7% and the figure for South Dakota was 59.7%. Source: the U.S. Census Bureau.

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Highest70.9Clay County
Lowest48.6Jerauld County
Median55.766 counties
South Dakota59.7History

Map of counties, 2015

Aurora County: 52.8 %Beadle County: 56.7 %Bennett County: 54.4 %Bon Homme County: 60.6 %Brookings County: 68.5 %Brown County: 60.1 %Brule County: 57.5 %Buffalo County: 51.5 %Butte County: 56.7 %Campbell County: 56.4 %Charles Mix County: 52.9 %Clark County: 55.2 %Clay County: 70.9 %Codington County: 59.6 %Corson County: 54.4 %Custer County: 55.7 %Davison County: 59.8 %Day County: 53.5 %Deuel County: 56.2 %Dewey County: 57 %Douglas County: 52.5 %Edmunds County: 55.1 %Fall River County: 53.3 %Faulk County: 53.8 %Grant County: 56.4 %Gregory County: 51.7 %Haakon County: 56.3 %Hamlin County: 51.2 %Hand County: 54.5 %Hanson County: 52.5 %Harding County: 59.5 %Hughes County: 60.4 %Hutchinson County: 52.5 %Hyde County: 54.7 %Jackson County: 53.5 %Jerauld County: 48.6 %Jones County: 55.8 %Kingsbury County: 55.7 %Lake County: 61.3 %Lawrence County: 61.6 %Lincoln County: 59.7 %Lyman County: 55.7 %McCook County: 54.8 %McPherson County: 51.5 %Marshall County: 57.3 %Meade County: 60.5 %Mellette County: 51.6 %Miner County: 55.1 %Minnehaha County: 62.3 %Moody County: 56.7 %Oglala Lakota County: 55.4 %Pennington County: 60.9 %Perkins County: 55.5 %Potter County: 51.1 %Roberts County: 53.6 %Sanborn County: 57.9 %Spink County: 56.7 %Stanley County: 58 %Sully County: 58.6 %Todd County: 52 %Tripp County: 55.6 %Turner County: 56.2 %Union County: 58.5 %Walworth County: 53.8 %Yankton County: 60.9 %Ziebach County: 54.4 %
  • Under 53
  • 53 to 54
  • 54 to 56
  • 56 to 57
  • 57 to 60
  • 60 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

Clay County: 70.9 %Clay County70.9Brookings County: 68.5 %Brookings County68.5Minnehaha County: 62.3 %Minnehaha County62.3Lawrence County: 61.6 %Lawrence County61.6Lake County: 61.3 %Lake County61.3Pennington County: 60.9 %Pennington County60.9Yankton County: 60.9 %Yankton County60.9Bon Homme County: 60.6 %Bon Homme County60.6Meade County: 60.5 %Meade County60.5Hughes County: 60.4 %Hughes County60.4Brown County: 60.1 %Brown County60.1Davison County: 59.8 %Davison County59.8Lincoln County: 59.7 %Lincoln County59.7Codington County: 59.6 %Codington County59.6Harding County: 59.5 %Harding County59.5Sully County: 58.6 %Sully County58.6Union County: 58.5 %Union County58.5Stanley County: 58 %Stanley County58Sanborn County: 57.9 %Sanborn County57.9Brule County: 57.5 %Brule County57.5Marshall County: 57.3 %Marshall County57.3Dewey County: 57 %Dewey County57Butte County: 56.7 %Butte County56.7Beadle County: 56.7 %Beadle County56.7Spink County: 56.7 %Spink County56.7Moody County: 56.7 %Moody County56.7Grant County: 56.4 %Grant County56.4Campbell County: 56.4 %Campbell County56.4Haakon County: 56.3 %Haakon County56.3Turner County: 56.2 %Turner County56.2Deuel County: 56.2 %Deuel County56.2Jones County: 55.8 %Jones County55.8Lyman County: 55.7 %Lyman County55.7Kingsbury County: 55.7 %Kingsbury County55.7Custer County: 55.7 %Custer County55.7Tripp County: 55.6 %Tripp County55.6Perkins County: 55.5 %Perkins County55.5Oglala Lakota County: 55.4 %Oglala Lakota County55.4Clark County: 55.2 %Clark County55.2Miner County: 55.1 %Miner County55.1Clay County: 70.9 %Clay County70.9Brookings County: 68.5 %Brookings County68.5Minnehaha County: 62.3 %Minnehaha County62.3Lawrence County: 61.6 %Lawrence County61.6Lake County: 61.3 %Lake County61.3Pennington County: 60.9 %Pennington County60.9Yankton County: 60.9 %Yankton County60.9Bon Homme County: 60.6 %Bon Homme County60.6Meade County: 60.5 %Meade County60.5Hughes County: 60.4 %Hughes County60.4Brown County: 60.1 %Brown County60.1Davison County: 59.8 %Davison County59.8Lincoln County: 59.7 %Lincoln County59.7Codington County: 59.6 %Codington County59.6Harding County: 59.5 %Harding County59.5Sully County: 58.6 %Sully County58.6Union County: 58.5 %Union County58.5Stanley County: 58 %Stanley County58Sanborn County: 57.9 %Sanborn County57.9Brule County: 57.5 %Brule County57.5Marshall County: 57.3 %Marshall County57.3Dewey County: 57 %Dewey County57Butte County: 56.7 %Butte County56.7Beadle County: 56.7 %Beadle County56.7Spink County: 56.7 %Spink County56.7Moody County: 56.7 %Moody County56.7Grant County: 56.4 %Grant County56.4Campbell County: 56.4 %Campbell County56.4Haakon County: 56.3 %Haakon County56.3Turner County: 56.2 %Turner County56.2Deuel County: 56.2 %Deuel County56.2Jones County: 55.8 %Jones County55.8Lyman County: 55.7 %Lyman County55.7Kingsbury County: 55.7 %Kingsbury County55.7Custer County: 55.7 %Custer County55.7Tripp County: 55.6 %Tripp County55.6Perkins County: 55.5 %Perkins County55.5Oglala Lakota County: 55.4 %Oglala Lakota County55.4Clark County: 55.2 %Clark County55.2Miner County: 55.1 %Miner County55.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2015 (%)Change on 2014
1Clay County70.9-0 pts
2Brookings County68.5-0.8 pts
3Minnehaha County62.3-0.5 pts
4Lawrence County61.6-0.7 pts
5Lake County61.3-0.7 pts
6Pennington County60.9-0.4 pts
7Yankton County60.9-0.4 pts
8Bon Homme County60.6-0.3 pts
9Meade County60.5-0.7 pts
10Hughes County60.4-0.7 pts
11Brown County60.1-0.2 pts
12Davison County59.8-0.3 pts
13Lincoln County59.7-0.5 pts
14Codington County59.6-0.5 pts
15Harding County59.5-1.3 pts
16Sully County58.6-0.9 pts
17Union County58.5-0.3 pts
18Stanley County58-1.1 pts
19Sanborn County57.9-0.6 pts
20Brule County57.5-0.4 pts
21Marshall County57.3-1.3 pts
22Dewey County57-0.1 pts
23Butte County56.7-0.6 pts
24Beadle County56.7-0.7 pts
25Spink County56.7+0.2 pts
26Moody County56.7-0.8 pts
27Grant County56.4-0.9 pts
28Campbell County56.4-0.2 pts
29Haakon County56.3+1.4 pts
30Turner County56.2-0.1 pts
31Deuel County56.2-0.3 pts
32Jones County55.8-2.7 pts
33Lyman County55.7-0.3 pts
34Kingsbury County55.7-0.4 pts
35Custer County55.7-0.8 pts
36Tripp County55.6-0.6 pts
37Perkins County55.5-0.2 pts
38Oglala Lakota County55.4-0.1 pts
39Clark County55.2-1.1 pts
40Miner County55.1+0.7 pts
41Edmunds County55.1-0.4 pts
42McCook County54.8-0.3 pts
43Hyde County54.7-0.6 pts
44Hand County54.5-0.4 pts
45Corson County54.4-1.1 pts
46Bennett County54.4+0.6 pts
47Ziebach County54.4+0.8 pts
48Walworth County53.8+0.6 pts
49Faulk County53.8-0.7 pts
50Roberts County53.6-0.2 pts
51Jackson County53.5-0.2 pts
52Day County53.5-0.2 pts
53Fall River County53.3-1.4 pts
54Charles Mix County52.9-0.1 pts
55Aurora County52.8+0.1 pts
56Hanson County52.5+0.1 pts
57Douglas County52.5-0.3 pts
58Hutchinson County52.5+0.1 pts
59Todd County52-0.7 pts
60Gregory County51.7-0.8 pts
61Mellette County51.6-1.3 pts
62Buffalo County51.5+0.1 pts
63McPherson County51.5+0.8 pts
64Hamlin County51.2-0.1 pts
65Potter County51.1-0.5 pts
66Jerauld County48.6-2.6 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, 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 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, 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-18-64/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 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, 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-18-64/south-dakota-counties?period=2015.

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, 2015 [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=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 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, 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-18-64/south-dakota-counties?period=2015. 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, 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-18-64/south-dakota-counties?period=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties?period=2015.
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 70.9% in 2015, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jerauld County, with 48.6% 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 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