RANKING · 2020 CENSUS · 66 SHOWN OF 66

Youngest by median age, South Dakota counties · 2020

South Dakota counties with the youngest median age (2020 ACS). This list covers the 66 counties in South Dakota that qualify, ranked against each other statewide. The median across all 66 is 42.0.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Clay County, SDSD15,03125.1+1%

02Todd County, SDSD8,86325.1+16%

03Oglala Lakota County, SDSD13,33825.7–

04Buffalo County, SDSD1,80225.8+10%

05Ziebach County, SDSD2,38928.9+21%

06Brookings County, SDSD37,63529.7+12%

07Corson County, SDSD3,78130.5+8%

08Bennett County, SDSD3,30732.3+11%

09Dewey County, SDSD5,41932.4+22%

10Jackson County, SDSD2,66633.5+9%

11Mellette County, SDSD2,13734.8+8%

12Lincoln County, SDSD77,14535.0+3%

13Hamlin County, SDSD6,90035.1−8%

14Lyman County, SDSD3,69435.7+3%

15Minnehaha County, SDSD212,69135.9+7%

16Beadle County, SDSD19,62436.2−10%

17Meade County, SDSD30,71136.7+10%

18Charles Mix County, SDSD9,30336.9+3%

19Brown County, SDSD37,56138.2+3%

20Pennington County, SDSD116,79238.9+11%

21Codington County, SDSD29,56239.1+11%

22Roberts County, SDSD10,25539.2+6%

23Hanson County, SDSD3,45639.3+9%

24Hughes County, SDSD17,57039.3+5%

25Davison County, SDSD20,06939.5+10%

26Clark County, SDSD4,03139.8−4%

27Lake County, SDSD10,99340.0+10%

28Sanborn County, SDSD2,38840.5−1%

29Moody County, SDSD6,63241.0+11%

30Union County, SDSD17,40241.0+11%

31Harding County, SDSD1,33141.2+10%

32Butte County, SDSD10,85641.3+9%

33McCook County, SDSD5,96441.6+8%

34Turner County, SDSD9,31442.0+4%

35Aurora County, SDSD2,80142.2+4%

36Yankton County, SDSD23,63542.3+14%

37Hutchinson County, SDSD7,41342.4−2%

38Marshall County, SDSD4,42642.6+2%

39Stanley County, SDSD3,01842.6+13%

40Spink County, SDSD6,15542.9+8%

41Tripp County, SDSD5,70843.0+9%

42Bon Homme County, SDSD7,24443.1+7%

43Brule County, SDSD5,27843.3+17%

44Haakon County, SDSD1,80243.3+5%

45Lawrence County, SDSD29,45943.5+17%

46Walworth County, SDSD5,21743.7+2%

47Deuel County, SDSD4,40843.9+8%

48Edmunds County, SDSD4,02244.7+7%

49Grant County, SDSD7,53444.8+11%

50Kingsbury County, SDSD5,28444.8+5%

51Jones County, SDSD91345.2+10%

52Miner County, SDSD2,28145.3+7%

53Sully County, SDSD1,47945.4+13%

54Hyde County, SDSD1,19145.5+8%

55Faulk County, SDSD2,17846.4+12%

56Douglas County, SDSD2,88846.6+11%

57Hand County, SDSD3,12146.9+8%

58Day County, SDSD5,48447.2+10%

59Perkins County, SDSD2,85347.2+10%

60Gregory County, SDSD4,03748.0+8%

61Jerauld County, SDSD1,65450.5+9%

62McPherson County, SDSD2,34751.6+8%

63Potter County, SDSD2,37752.2+14%

64Campbell County, SDSD1,37753.5+28%

65Fall River County, SDSD7,46755.1+21%

66Custer County, SDSD9,43156.4+31%

SHOWING 1–66 OF 66

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS