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

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

Custer County had the highest share of population aged 65 and over of 66 counties in 2021, at 33.3%. Oglala Lakota County had the lowest, at 7.4%. The median was 21.3% and the figure for South Dakota was 18%. Source: the U.S. Census Bureau.

Highest33.3Custer County
Lowest7.4Oglala Lakota County
Median21.366 counties
South Dakota18History

Top 40 counties, 2021

CSVChart (SVG)

Custer CountyCuster County: 33.3 %33.3Fall River CountyFall River County: 32.9 %32.9Jerauld CountyJerauld County: 31 %31Potter CountyPotter County: 30.8 %30.8McPherson CountyMcPherson County: 29.5 %29.5Campbell CountyCampbell County: 28 %28Gregory CountyGregory County: 27.7 %27.7Perkins CountyPerkins County: 27.1 %27.1Hand CountyHand County: 27 %27Faulk CountyFaulk County: 26.8 %26.8Douglas CountyDouglas County: 26.7 %26.7Hyde CountyHyde County: 26.5 %26.5Day CountyDay County: 26.4 %26.4Miner CountyMiner County: 25 %25Walworth CountyWalworth County: 24.9 %24.9Kingsbury CountyKingsbury County: 24.7 %24.7Haakon CountyHaakon County: 24.6 %24.6Grant CountyGrant County: 24.4 %24.4Lawrence CountyLawrence County: 24.2 %24.2Jones CountyJones County: 23.9 %23.9Marshall CountyMarshall County: 23.7 %23.7Hutchinson CountyHutchinson County: 23.6 %23.6Sully CountySully County: 23.3 %23.3Edmunds CountyEdmunds County: 23.3 %23.3Spink CountySpink County: 22.9 %22.9Deuel CountyDeuel County: 22.3 %22.3Tripp CountyTripp County: 22.2 %22.2Sanborn CountySanborn County: 22 %22Aurora CountyAurora County: 22 %22Brule CountyBrule County: 21.9 %21.9Clark CountyClark County: 21.7 %21.7Bon Homme CountyBon Homme County: 21.5 %21.5Butte CountyButte County: 21.3 %21.3Turner CountyTurner County: 21.3 %21.3Roberts CountyRoberts County: 21.2 %21.2Yankton CountyYankton County: 21.2 %21.2Stanley CountyStanley County: 21.1 %21.1Harding CountyHarding County: 20.7 %20.7Lake CountyLake County: 20.6 %20.6McCook CountyMcCook County: 20.5 %20.5
%. Source: Invokely calculation with data from U.S. Census Bureau. Retrieved 2026-10-09.

Full ranking

RankCounties2021 (%)Change on 2020
1Custer County33.3+0.5 pts
2Fall River County32.9+0.2 pts
3Jerauld County31+0.7 pts
4Potter County30.8-0.3 pts
5McPherson County29.5+0.3 pts
6Campbell County28+0.6 pts
7Gregory County27.7+0.5 pts
8Perkins County27.1+0.4 pts
9Hand County27+0.6 pts
10Faulk County26.8-0.4 pts
11Douglas County26.7+0.1 pts
12Hyde County26.5+1 pts
13Day County26.40 pts
14Miner County25-0.3 pts
15Walworth County24.9-0.1 pts
16Kingsbury County24.7+0.3 pts
17Haakon County24.6+0.8 pts
18Grant County24.4+0.2 pts
19Lawrence County24.2+0.7 pts
20Jones County23.9+0.7 pts
21Marshall County23.7+0.3 pts
22Hutchinson County23.6+0.2 pts
23Sully County23.3+1.3 pts
24Edmunds County23.3-0.2 pts
25Spink County22.9+0.6 pts
26Deuel County22.3+0.5 pts
27Tripp County22.2+0.3 pts
28Sanborn County22+0.5 pts
29Aurora County22+0.2 pts
30Brule County21.9+0.6 pts
31Clark County21.7+0.4 pts
32Bon Homme County21.50 pts
33Butte County21.3+0.2 pts
34Turner County21.3-0.3 pts
35Roberts County21.2+0.4 pts
36Yankton County21.2+0.6 pts
37Stanley County21.1+0.4 pts
38Harding County20.7+0.3 pts
39Lake County20.6+0.6 pts
40McCook County20.5+0.1 pts
41Moody County20.3+0.3 pts
42Davison County20.2+0.4 pts
43Union County19.5+0.7 pts
44Codington County19.1+0.4 pts
45Pennington County18.7+0.2 pts
46Brown County18.5+0.4 pts
47Hughes County18.5+0.5 pts
48Charles Mix County18.1+0.1 pts
49Beadle County17.8+0.2 pts
50Hamlin County17.2-0.6 pts
51Meade County17.1+0.5 pts
52Hanson County17-0.8 pts
53Mellette County16.7+0.4 pts
54Lyman County16.1-0.1 pts
55Minnehaha County14.7+0.1 pts
56Bennett County14.50 pts
57Brookings County14.1+0.6 pts
58Lincoln County13.9+0.5 pts
59Jackson County13.5-0.7 pts
60Clay County13.4+0.3 pts
61Corson County12.5-0.1 pts
62Dewey County11.4-0.1 pts
63Ziebach County10.5-0.1 pts
64Buffalo County10.1-0.6 pts
65Todd County8.4+0.3 pts
66Oglala Lakota County7.40 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 33.3% in 2021, according to the U.S. Census Bureau.

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

Oglala Lakota County, with 7.4% in 2021.

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