RANKING · 1990 CENSUS · 65 SHOWN OF 65

Youngest by median age, South Dakota counties · 1990

South Dakota counties with the youngest median age (1990 ACS). This list covers the 65 counties in South Dakota that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS –

01Todd County, SDSD8,86320.6–

02Buffalo County, SDSD1,80222.2–

03Clay County, SDSD15,03124.0–

04Ziebach County, SDSD2,38924.8–

05Dewey County, SDSD5,41926.0–

06Brookings County, SDSD37,63526.3–

07Corson County, SDSD3,78128.7–

08Bennett County, SDSD3,30729.7–

09Jackson County, SDSD2,66629.8–

10Meade County, SDSD30,71130.1–

11Pennington County, SDSD116,79230.2–

12Mellette County, SDSD2,13730.4–

13Lyman County, SDSD3,69431.3–

14Minnehaha County, SDSD212,69131.5–

15Haakon County, SDSD1,80231.7–

16Harding County, SDSD1,33132.4–

17Lawrence County, SDSD29,45932.5–

18Stanley County, SDSD3,01832.8–

19Brule County, SDSD5,27832.8–

20Codington County, SDSD29,56232.9–

21Brown County, SDSD37,56133.1–

22Hughes County, SDSD17,57033.2–

23Lincoln County, SDSD77,14533.2–

24Yankton County, SDSD23,63533.5–

25Davison County, SDSD20,06933.6–

26Charles Mix County, SDSD9,30333.8–

27Lake County, SDSD10,99333.9–

28Moody County, SDSD6,63234.2–

29Tripp County, SDSD5,70834.5–

30Butte County, SDSD10,85634.6–

31Grant County, SDSD7,53434.9–

32Union County, SDSD17,40235.0–

33Roberts County, SDSD10,25535.3–

34Beadle County, SDSD19,62435.5–

35Sully County, SDSD1,47935.5–

36Sanborn County, SDSD2,38835.9–

37Spink County, SDSD6,15536.0–

38Jones County, SDSD91336.5–

39Hanson County, SDSD3,45636.9–

40Custer County, SDSD9,43137.0–

41Douglas County, SDSD2,88837.1–

42Bon Homme County, SDSD7,24437.4–

43Hamlin County, SDSD6,90037.7–

44Gregory County, SDSD4,03738.2–

45McCook County, SDSD5,96438.3–

46Aurora County, SDSD2,80138.4–

47Hand County, SDSD3,12138.5–

48Deuel County, SDSD4,40838.6–

49Hyde County, SDSD1,19138.8–

50Marshall County, SDSD4,42638.9–

51Clark County, SDSD4,03139.0–

52Miner County, SDSD2,28139.1–

53Faulk County, SDSD2,17839.1–

54Potter County, SDSD2,37739.1–

55Perkins County, SDSD2,85339.2–

56Campbell County, SDSD1,37739.3–

57Turner County, SDSD9,31439.3–

58Day County, SDSD5,48439.3–

59Kingsbury County, SDSD5,28439.8–

60Walworth County, SDSD5,21739.9–

61Edmunds County, SDSD4,02240.3–

62Jerauld County, SDSD1,65441.2–

63Hutchinson County, SDSD7,41341.5–

64Fall River County, SDSD7,46741.6–

65McPherson County, SDSD2,34746.6–

SHOWING 1–65 OF 65

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS