Data / Rankings / Median age / Counties in South Dakota

Counties in South Dakota by median age

Custer County had the highest median age of 66 counties in 2023, at 57.2 years. Clay County had the lowest, at 24.5 years. The median was 41.3 years and the figure for South Dakota was 37.7 years. Source: the U.S. Census Bureau.

Highest57.2Custer County
Lowest24.5Clay County
Median41.366 counties
South Dakota37.7History

Top 40 counties, 2023

CSVChart (SVG)

Custer CountyCuster County: 57.2 years57.2Fall River CountyFall River County: 54.5 years54.5Campbell CountyCampbell County: 52.4 years52.4Sully CountySully County: 51.4 years51.4Hyde CountyHyde County: 50.9 years50.9Harding CountyHarding County: 48.9 years48.9Miner CountyMiner County: 48.9 years48.9McPherson CountyMcPherson County: 48.8 years48.8Day CountyDay County: 47.1 years47.1Haakon CountyHaakon County: 47.1 years47.1Jerauld CountyJerauld County: 46.5 years46.5Gregory CountyGregory County: 45.7 years45.7Spink CountySpink County: 45.1 years45.1Tripp CountyTripp County: 45.1 years45.1Potter CountyPotter County: 44.9 years44.9Hand CountyHand County: 43.8 years43.8Lawrence CountyLawrence County: 43.8 years43.8Grant CountyGrant County: 43.7 years43.7Lake CountyLake County: 43.7 years43.7Stanley CountyStanley County: 43.7 years43.7Edmunds CountyEdmunds County: 43.6 years43.6Perkins CountyPerkins County: 43.6 years43.6Faulk CountyFaulk County: 43.2 years43.2Marshall CountyMarshall County: 42.8 years42.8Aurora CountyAurora County: 42.4 years42.4Yankton CountyYankton County: 42.2 years42.2Deuel CountyDeuel County: 42 years42Douglas CountyDouglas County: 41.9 years41.9Kingsbury CountyKingsbury County: 41.9 years41.9Bon Homme CountyBon Homme County: 41.8 years41.8Hutchinson CountyHutchinson County: 41.6 years41.6Walworth CountyWalworth County: 41.6 years41.6Brule CountyBrule County: 41.4 years41.4Turner CountyTurner County: 41.3 years41.3Clark CountyClark County: 40.6 years40.6Moody CountyMoody County: 40.5 years40.5Union CountyUnion County: 40.4 years40.4Codington CountyCodington County: 39.9 years39.9McCook CountyMcCook County: 39.9 years39.9Davison CountyDavison County: 39.8 years39.8
years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

RankCounties2023
years		Change on 2022
1Custer County57.2+0.4
2Fall River County54.5-0.2
3Campbell County52.4+2
4Sully County51.4-1.3
5Hyde County50.9+3.9
6Harding County48.9+3.8
6Miner County48.9+0.1
8McPherson County48.8-2.1
9Day County47.1-0.1
9Haakon County47.1+2.4
11Jerauld County46.5-4
12Gregory County45.70
13Spink County45.1+0.1
13Tripp County45.1+0.4
15Potter County44.9+0.2
16Hand County43.8-0.8
16Lawrence County43.8+0.8
18Grant County43.7-0.1
18Lake County43.7-0.6
18Stanley County43.7+0.5
21Edmunds County43.6-0.1
21Perkins County43.6-1.8
23Faulk County43.2-2.6
24Marshall County42.8-0.9
25Aurora County42.4+1
26Yankton County42.2+0.5
27Deuel County420
28Douglas County41.9+0.3
28Kingsbury County41.90
30Bon Homme County41.8-0.3
31Hutchinson County41.6-0.1
31Walworth County41.6+0.7
33Brule County41.4-0.1
34Turner County41.3-0.7
35Clark County40.6-0.6
36Moody County40.5-0.1
37Union County40.4+0.3
38Codington County39.9+0.3
38McCook County39.9+0.4
40Davison County39.8+0.1
41Pennington County39.7+0.1
42Butte County39.3-1
42Hughes County39.3+0.1
44Sanborn County38.6-0.7
45Hanson County37.9+0.6
45Roberts County37.9+0.9
47Brown County37.8+0.5
48Meade County37+0.5
49Beadle County36.9-0.6
50Ziebach County36.6+2.3
51Charles Mix County36.1+0.7
52Lyman County360
53Lincoln County35.8-0.1
54Minnehaha County35.7+0.1
55Jones County33.6-8.2
56Jackson County33.2-0.2
57Hamlin County32.5-0.6
58Mellette County31-5.3
59Corson County29.9+0.9
60Bennett County28.8+1.8
61Brookings County28+0.3
62Dewey County27.6+0.5
63Oglala Lakota County27+0.7
64Buffalo County26.2+2.2
65Todd County25.4+0.3
66Clay County24.5-0.1

Other periods

About this ranking

Age that divides the resident population into two halves of equal size. Spain and the EU: on 1 January. United States: American Community Survey five-year estimate, where the period shown is the last year of the five-year span.

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. American Community Survey 5-year estimates, table B01002: median age, total population. https://www2.census.gov/programs-surveys/acs/summary_file/2023/table-based-SF/data/5YRData/acsdt5y2023-b01002.dat. Retrieved 2026-10-08.

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 median age using official data, and cite the source.
rank_places {"indicator":"median_age","level":"province","within":"South Dakota","limit":10}
GET https://invokely.ai/api/v1/rank?indicator=median_age&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 median age?

Custer County, with 57.2 years in 2023, according to the U.S. Census Bureau.

Which county has the lowest median age?

Clay County, with 24.5 years in 2023.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Census Bureau, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.

Median age: other rankings

Counties in South Dakota: more rankings