Data / Rankings / Population aged 65 and over / Counties in South Dakota

Counties in South Dakota by share of population aged 65 and over, 2025

Custer County had the highest share of population aged 65 and over of 66 counties in 2025, at 36.6%. Oglala Lakota County had the lowest, at 7.9%. The median was 23.4% and the figure for South Dakota was 19.4%. Source: the U.S. Census Bureau.

Highest36.6Custer County
Lowest7.9Oglala Lakota County
Median23.466 counties
South Dakota19.4History

Top 40 counties, 2025

CSVChart (SVG)

Custer CountyCuster County: 36.6 %36.6Fall River CountyFall River County: 35.6 %35.6Potter CountyPotter County: 34.3 %34.3McPherson CountyMcPherson County: 32.3 %32.3Jerauld CountyJerauld County: 32 %32Campbell CountyCampbell County: 31.2 %31.2Perkins CountyPerkins County: 29.8 %29.8Gregory CountyGregory County: 29.3 %29.3Day CountyDay County: 28.5 %28.5Haakon CountyHaakon County: 27.9 %27.9Douglas CountyDouglas County: 27.8 %27.8Hand CountyHand County: 27.7 %27.7Sully CountySully County: 27.2 %27.2Miner CountyMiner County: 27.1 %27.1Jones CountyJones County: 27.1 %27.1Lawrence CountyLawrence County: 26.6 %26.6Hyde CountyHyde County: 26.4 %26.4Grant CountyGrant County: 26.2 %26.2Kingsbury CountyKingsbury County: 25.6 %25.6Edmunds CountyEdmunds County: 25.5 %25.5Walworth CountyWalworth County: 25.3 %25.3Brule CountyBrule County: 25 %25Faulk CountyFaulk County: 24.9 %24.9Spink CountySpink County: 24.8 %24.8Yankton CountyYankton County: 24.4 %24.4Marshall CountyMarshall County: 24.1 %24.1Hutchinson CountyHutchinson County: 24.1 %24.1Harding CountyHarding County: 23.6 %23.6Butte CountyButte County: 23.5 %23.5Lake CountyLake County: 23.5 %23.5Tripp CountyTripp County: 23.5 %23.5Deuel CountyDeuel County: 23.4 %23.4Stanley CountyStanley County: 23.4 %23.4Sanborn CountySanborn County: 23.4 %23.4Bon Homme CountyBon Homme County: 22.8 %22.8Aurora CountyAurora County: 22.4 %22.4Roberts CountyRoberts County: 22.2 %22.2McCook CountyMcCook County: 22.2 %22.2Davison CountyDavison County: 22.1 %22.1Clark CountyClark County: 21.9 %21.9
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2025 (%)Change on 2024
1Custer County36.6+1.1 pts
2Fall River County35.6+0.7 pts
3Potter County34.3+1 pts
4McPherson County32.3+0.4 pts
5Jerauld County32+0.6 pts
6Campbell County31.2+0.4 pts
7Perkins County29.8+0.6 pts
8Gregory County29.3+0.4 pts
9Day County28.5+0.6 pts
10Haakon County27.9+0.3 pts
11Douglas County27.8+0.2 pts
12Hand County27.7+0.2 pts
13Sully County27.2+0.8 pts
14Miner County27.1+0.3 pts
15Jones County27.1+1.2 pts
16Lawrence County26.6+0.6 pts
17Hyde County26.4+0.1 pts
18Grant County26.2+0.6 pts
19Kingsbury County25.6+0.4 pts
20Edmunds County25.5+0.7 pts
21Walworth County25.3+0.1 pts
22Brule County25+0.8 pts
23Faulk County24.9-0.4 pts
24Spink County24.8+0.5 pts
25Yankton County24.4+0.7 pts
26Marshall County24.1+0.6 pts
27Hutchinson County24.1+0.2 pts
28Harding County23.6+0.8 pts
29Butte County23.5+0.8 pts
30Lake County23.5+1 pts
31Tripp County23.5+0.4 pts
32Deuel County23.4+0.4 pts
33Stanley County23.4+1.2 pts
34Sanborn County23.4+0.4 pts
35Bon Homme County22.8+0.3 pts
36Aurora County22.4+0.5 pts
37Roberts County22.2+0.3 pts
38McCook County22.2+0.2 pts
39Davison County22.1+0.5 pts
40Clark County21.9+0.3 pts
41Moody County21.9+0.5 pts
42Union County21.8+0.7 pts
43Codington County21.1+0.5 pts
44Brown County20.7+0.6 pts
45Turner County20.7-0.3 pts
46Pennington County20+0.3 pts
47Hughes County19.9+0.3 pts
48Meade County19.6+0.7 pts
49Charles Mix County19.4+0.3 pts
50Beadle County18.6+0.1 pts
51Hanson County18.1+0.5 pts
52Lyman County17.6+0.5 pts
53Hamlin County16.5-0.3 pts
54Bennett County16.1+0.7 pts
55Lincoln County15.8+0.5 pts
56Minnehaha County15.4+0.1 pts
57Brookings County15.1+0.3 pts
58Mellette County14.7-0.8 pts
59Clay County14.2+0.3 pts
60Jackson County13.3-0.2 pts
61Corson County12.90 pts
62Buffalo County12.5+1.1 pts
63Dewey County11.3+0.4 pts
64Ziebach County10.6+0.2 pts
65Todd County8.70 pts
66Oglala Lakota County7.9+0.1 pts

Other periods

About this ranking

Residents aged 65 or over as a percentage of total population. Spain: 1 January, INE annual census. United States: 1 July, Census Bureau population estimates. World Bank figures for other countries and the World refer to mid-year.

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 (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. https://www2.census.gov/programs-surveys/popest/datasets/2020-2025/counties/asrh/cc-est2025-agesex-all.csv. Retrieved 2026-10-09.

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 share of population aged 65 and over using official data, and cite the source.
rank_places {"indicator":"population_65_plus_share","level":"province","within":"South Dakota","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=population_65_plus_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 share of population aged 65 and over?

Custer County, with 36.6% in 2025, according to the U.S. Census Bureau.

Which county has the lowest share of population aged 65 and over?

Oglala Lakota County, with 7.9% 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 (cc-est agesex): residents aged 65 and over as a percentage of the total, 1 July; states and the nation summed from counties. Retrieved 2026-10-09.

Population aged 65 and over: other rankings

Counties in South Dakota: more rankings