Counties in South Dakota by median age

Name: Counties in South Dakota by median age, 2021
Creator: U.S. Census Bureau
License: Public domain (US federal government work, citation requested)

Custer County had the highest median age of 66 counties in 2021, at 55.8 years. Todd County had the lowest, at 24.1 years. The median was 40.4 years and the figure for South Dakota was 37.1 years. Source: the U.S. Census Bureau.

Highest55.8Custer County

Lowest24.1Todd County

Median40.466 counties

South Dakota37.1History

Top 40 counties, 2021

CSV Chart (SVG)

years. Source: U.S. Census Bureau. Retrieved 2026-10-08.

Full ranking

Rank	Counties	2021 years
1	Custer County	55.8
2	Fall River County	54.3
3	McPherson County	52.1
4	Sully County	51.6
5	Jerauld County	50
6	Miner County	48.2
7	Potter County	48.1
8	Jones County	48
9	Day County	47.3
10	Hand County	46.7
11	Faulk County	46.6
12	Perkins County	46.3
13	Hyde County	46.1
14	Campbell County	45.9
15	Gregory County	45.1
16	Haakon County	44.9
17	Lake County	44.1
18	Spink County	43.9
19	Stanley County	43.3
20	Grant County	42.7
21	Tripp County	42.6
22	Kingsbury County	42.5
23	Marshall County	42.4
24	Douglas County	42.3
24	Lawrence County	42.3
26	Deuel County	42
26	Hutchinson County	42
28	Turner County	41.9
29	Edmunds County	41.7
30	Yankton County	41.6
31	Bon Homme County	41.5
32	Walworth County	41.4
33	Moody County	40.5
34	Clark County	40.3
35	Butte County	40.1
36	Union County	39.7
37	Brule County	39.3
37	Codington County	39.3
37	Davison County	39.3
37	McCook County	39.3
41	Hughes County	39
42	Pennington County	38.9
43	Harding County	38.5
44	Aurora County	38.1
45	Hanson County	38
46	Sanborn County	37.5
47	Roberts County	37.3
48	Brown County	37
49	Beadle County	36.9
50	Meade County	36.3
51	Charles Mix County	35.7
52	Lincoln County	35.5
53	Minnehaha County	35.3
54	Mellette County	35.1
55	Lyman County	35
56	Ziebach County	34.5
57	Hamlin County	33
58	Jackson County	32.7
59	Dewey County	28.1
60	Corson County	27.8
61	Brookings County	27.4
62	Oglala Lakota County	26.8
63	Bennett County	26
64	Buffalo County	25.4
65	Clay County	24.7
66	Todd County	24.1

Other periods

2024
2023
2022
2021

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/2021/table-based-SF/data/5YRData/acsdt5y2021-b01002.dat. Retrieved 2026-10-08.

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Rank Counties in South Dakota by median age using official data, and cite the source.

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Questions

Which county has the highest median age?

Custer County, with 55.8 years in 2021, according to the U.S. Census Bureau.

Which county has the lowest median age?

Todd County, with 24.1 years 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, American Community Survey 5-year estimates, table B01002: median age, total population. Retrieved 2026-10-08.