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

Counties in South Dakota by population aged 18 to 64, 2025

Clay County had the highest population aged 18 to 64 of 66 counties in 2025, at 69.6%. Jerauld County had the lowest, at 42.6%. The median was 51.9% and the figure for South Dakota was 57.1%. Source: the U.S. Census Bureau.

Keep it in a collection in your library.
Highest69.6Clay County
Lowest42.6Jerauld County
Median51.966 counties
South Dakota57.1History

Map of counties, 2025

Aurora County: 53.3 %Beadle County: 52.9 %Bennett County: 53 %Bon Homme County: 57.9 %Brookings County: 64.2 %Brown County: 57.1 %Brule County: 51.2 %Buffalo County: 52.5 %Butte County: 52.9 %Campbell County: 48.3 %Charles Mix County: 52.4 %Clark County: 49.9 %Clay County: 69.6 %Codington County: 57 %Corson County: 51.5 %Custer County: 47.7 %Davison County: 56.4 %Day County: 49.7 %Deuel County: 52 %Dewey County: 50 %Douglas County: 46.5 %Edmunds County: 53.4 %Fall River County: 48.8 %Faulk County: 48.3 %Grant County: 51 %Gregory County: 47.4 %Haakon County: 48.4 %Hamlin County: 51 %Hand County: 49.2 %Hanson County: 54 %Harding County: 51.8 %Hughes County: 57.1 %Hutchinson County: 50.1 %Hyde County: 49.5 %Jackson County: 51.7 %Jerauld County: 42.6 %Jones County: 48.7 %Kingsbury County: 49.6 %Lake County: 55.5 %Lawrence County: 57.2 %Lincoln County: 59.8 %Lyman County: 54.7 %McCook County: 51.1 %McPherson County: 48.6 %Marshall County: 50.3 %Meade County: 59.7 %Mellette County: 44.4 %Miner County: 50.6 %Minnehaha County: 60.2 %Moody County: 51.6 %Oglala Lakota County: 57 %Pennington County: 58.1 %Perkins County: 48.5 %Potter County: 45.5 %Roberts County: 49.6 %Sanborn County: 52 %Spink County: 52.3 %Stanley County: 54.2 %Sully County: 56 %Todd County: 54.8 %Tripp County: 50.9 %Turner County: 52 %Union County: 55.3 %Walworth County: 51.4 %Yankton County: 55.8 %Ziebach County: 56.7 %
  • Under 49
  • 49 to 50
  • 50 to 52
  • 52 to 54
  • 54 to 57
  • 57 and over
%, 2025. Source: Invokely calculation with data from U.S. Census Bureau. Boundaries: U.S. Census Bureau cartographic boundary files.

Top 40 counties, 2025

Clay County: 69.6 %Clay County69.6Brookings County: 64.2 %Brookings County64.2Minnehaha County: 60.2 %Minnehaha County60.2Lincoln County: 59.8 %Lincoln County59.8Meade County: 59.7 %Meade County59.7Pennington County: 58.1 %Pennington County58.1Bon Homme County: 57.9 %Bon Homme County57.9Lawrence County: 57.2 %Lawrence County57.2Brown County: 57.1 %Brown County57.1Hughes County: 57.1 %Hughes County57.1Codington County: 57 %Codington County57Oglala Lakota County: 57 %Oglala Lakota County57Ziebach County: 56.7 %Ziebach County56.7Davison County: 56.4 %Davison County56.4Sully County: 56 %Sully County56Yankton County: 55.8 %Yankton County55.8Lake County: 55.5 %Lake County55.5Union County: 55.3 %Union County55.3Todd County: 54.8 %Todd County54.8Lyman County: 54.7 %Lyman County54.7Stanley County: 54.2 %Stanley County54.2Hanson County: 54 %Hanson County54Edmunds County: 53.4 %Edmunds County53.4Aurora County: 53.3 %Aurora County53.3Bennett County: 53 %Bennett County53Butte County: 52.9 %Butte County52.9Beadle County: 52.9 %Beadle County52.9Buffalo County: 52.5 %Buffalo County52.5Charles Mix County: 52.4 %Charles Mix County52.4Spink County: 52.3 %Spink County52.3Deuel County: 52 %Deuel County52Sanborn County: 52 %Sanborn County52Turner County: 52 %Turner County52Harding County: 51.8 %Harding County51.8Jackson County: 51.7 %Jackson County51.7Moody County: 51.6 %Moody County51.6Corson County: 51.5 %Corson County51.5Walworth County: 51.4 %Walworth County51.4Brule County: 51.2 %Brule County51.2McCook County: 51.1 %McCook County51.1Clay County: 69.6 %Clay County69.6Brookings County: 64.2 %Brookings County64.2Minnehaha County: 60.2 %Minnehaha County60.2Lincoln County: 59.8 %Lincoln County59.8Meade County: 59.7 %Meade County59.7Pennington County: 58.1 %Pennington County58.1Bon Homme County: 57.9 %Bon Homme County57.9Lawrence County: 57.2 %Lawrence County57.2Brown County: 57.1 %Brown County57.1Hughes County: 57.1 %Hughes County57.1Codington County: 57 %Codington County57Oglala Lakota County: 57 %Oglala Lakota County57Ziebach County: 56.7 %Ziebach County56.7Davison County: 56.4 %Davison County56.4Sully County: 56 %Sully County56Yankton County: 55.8 %Yankton County55.8Lake County: 55.5 %Lake County55.5Union County: 55.3 %Union County55.3Todd County: 54.8 %Todd County54.8Lyman County: 54.7 %Lyman County54.7Stanley County: 54.2 %Stanley County54.2Hanson County: 54 %Hanson County54Edmunds County: 53.4 %Edmunds County53.4Aurora County: 53.3 %Aurora County53.3Bennett County: 53 %Bennett County53Butte County: 52.9 %Butte County52.9Beadle County: 52.9 %Beadle County52.9Buffalo County: 52.5 %Buffalo County52.5Charles Mix County: 52.4 %Charles Mix County52.4Spink County: 52.3 %Spink County52.3Deuel County: 52 %Deuel County52Sanborn County: 52 %Sanborn County52Turner County: 52 %Turner County52Harding County: 51.8 %Harding County51.8Jackson County: 51.7 %Jackson County51.7Moody County: 51.6 %Moody County51.6Corson County: 51.5 %Corson County51.5Walworth County: 51.4 %Walworth County51.4Brule County: 51.2 %Brule County51.2McCook County: 51.1 %McCook County51.1
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-12.

Full ranking

RankCounties2025 (%)Change on 2024
1Clay County69.6-0.1 pts
2Brookings County64.2-0.3 pts
3Minnehaha County60.2+0.1 pts
4Lincoln County59.8+0.4 pts
5Meade County59.7-0 pts
6Pennington County58.1-0 pts
7Bon Homme County57.9-0.5 pts
8Lawrence County57.2-0.1 pts
9Brown County57.1-0.2 pts
10Hughes County57.1+0.1 pts
11Codington County57-0 pts
12Oglala Lakota County57+0.4 pts
13Ziebach County56.7-0.7 pts
14Davison County56.4-0.1 pts
15Sully County56+0.5 pts
16Yankton County55.8-0.4 pts
17Lake County55.5-0.7 pts
18Union County55.3-0.3 pts
19Todd County54.8+1.2 pts
20Lyman County54.7-1 pts
21Stanley County54.2-1 pts
22Hanson County54-0 pts
23Edmunds County53.4-0.3 pts
24Aurora County53.3-0.2 pts
25Bennett County53-0.8 pts
26Butte County52.9-0.5 pts
27Beadle County52.9-0.4 pts
28Buffalo County52.5+0.3 pts
29Charles Mix County52.4-0.2 pts
30Spink County52.3-0.7 pts
31Deuel County52-0.3 pts
32Sanborn County52-0.2 pts
33Turner County520 pts
34Harding County51.8-1.1 pts
35Jackson County51.7+0.8 pts
36Moody County51.6+0.3 pts
37Corson County51.5-0.1 pts
38Walworth County51.4-0.1 pts
39Brule County51.2-0.7 pts
40McCook County51.1-0.1 pts
41Grant County51-0.5 pts
42Hamlin County51+0.6 pts
43Tripp County50.9-0.3 pts
44Miner County50.6-0.5 pts
45Marshall County50.3+0.3 pts
46Hutchinson County50.1-0.1 pts
47Dewey County50-0.3 pts
48Clark County49.9-0.1 pts
49Day County49.7-0.5 pts
50Roberts County49.6-0.2 pts
51Kingsbury County49.6-0.7 pts
52Hyde County49.5-1.5 pts
53Hand County49.2-0.2 pts
54Fall River County48.8-0.9 pts
55Jones County48.7-0.8 pts
56McPherson County48.6-0.7 pts
57Perkins County48.5-0.3 pts
58Haakon County48.4-0.2 pts
59Faulk County48.3-0.7 pts
60Campbell County48.3-0.9 pts
61Custer County47.7-0.5 pts
62Gregory County47.4-0.3 pts
63Douglas County46.5-0.3 pts
64Potter County45.5-1.5 pts
65Mellette County44.4-2.2 pts
66Jerauld County42.6-0.7 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, 2025) [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, 2025. 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. 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, 2025. 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.

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, 2025 [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 (Accessed: 12 October 2026).

BibTeX
@misc{census_counties_in_south_dakota_2025,
  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, 2025}},
  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. 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, 2025
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
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/population-18-64/south-dakota-counties.
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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

Rank Counties in South Dakota by population aged 18 to 64 using official data, and cite the source.
rank_places {"indicator":"population_18_64_share","level":"province","within":"South Dakota","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_18_64_share&level=province&within=South%20Dakota&limit=10

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

Which county has the highest population aged 18 to 64?

Clay County, with 69.6% in 2025, according to the U.S. Census Bureau.

Which county has the lowest population aged 18 to 64?

Jerauld County, with 42.6% in 2025.

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