RANKING · 2020 CENSUS · 115 SHOWN OF 115

Youngest by median age, Missouri counties · 2020

Missouri counties with the youngest median age (2020 ACS). This list covers the 115 counties in Missouri that qualify, ranked against each other statewide. The median across all 115 is 41.7.

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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 2000

01Pulaski County, MOMO54,44227.3−4%

02Adair County, MOMO25,68430.5+9%

03Boone County, MOMO191,74631.9+8%

04Johnson County, MOMO56,67032.1+13%

05Nodaway County, MOMO20,17433.4+11%

06St. Louis, MOMO278,14435.4+5%

07Phelps County, MOMO45,24735.7+2%

08Jasper County, MOMO127,42836.0+3%

09Scotland County, MOMO4,79636.7−2%

10Jackson County, MOMO732,99436.8+5%

11Greene County, MOMO309,28636.8+5%

12Saline County, MOMO23,26536.9−1%

13Clay County, MOMO265,03237.3+7%

14Cape Girardeau County, MOMO83,99937.4+6%

15Lincoln County, MOMO66,67637.4+8%

16Webster County, MOMO43,05437.6+9%

17McDonald County, MOMO23,99237.8+10%

18Pettis County, MOMO44,25437.9+4%

19Christian County, MOMO96,72538.1+10%

20Platte County, MOMO114,40038.3+7%

21Howard County, MOMO10,18038.8+6%

22Moniteau County, MOMO15,42838.9+8%

23Pemiscot County, MOMO14,46539.0+13%

24Buchanan County, MOMO83,54039.1+8%

25Lewis County, MOMO9,87939.3+9%

26Polk County, MOMO33,60439.3+12%

27St. Charles County, MOMO426,49939.3+15%

28Callaway County, MOMO45,76539.5+14%

29Cole County, MOMO77,90839.8+12%

30Audrain County, MOMO24,52839.9+5%

31Lawrence County, MOMO39,40140.0+8%

32Marion County, MOMO28,52540.1+8%

33Scott County, MOMO37,97540.1+11%

34Vernon County, MOMO19,94640.1+8%

35Cass County, MOMO115,85940.2+12%

36Gentry County, MOMO6,38440.30%

37Jefferson County, MOMO233,13240.3+15%

38St. Francois County, MOMO67,80940.3+8%

39Grundy County, MOMO9,74440.4−2%

40Newton County, MOMO62,26340.4+9%

41Butler County, MOMO41,90440.5+5%

42Randolph County, MOMO24,51340.5+9%

43Daviess County, MOMO8,55840.6+4%

44Pike County, MOMO17,95540.6+8%

45Wright County, MOMO19,67140.6+8%

46St. Louis County, MOMO990,91140.6+8%

47Cooper County, MOMO17,13640.7+16%

48Warren County, MOMO39,01640.7+9%

49Laclede County, MOMO36,94340.8+11%

50Dunklin County, MOMO26,85540.9+8%

51Andrew County, MOMO18,24141.1+9%

52Barton County, MOMO11,79541.1+10%

53Miller County, MOMO25,81741.3+11%

54Osage County, MOMO13,61141.3+14%

55Schuyler County, MOMO4,14041.3+1%

56Howell County, MOMO40,79841.5+9%

57Livingston County, MOMO14,70841.5+5%

58Franklin County, MOMO108,09041.7+16%

59Lafayette County, MOMO33,53141.7+10%

60Perry County, MOMO19,09342.1+14%

61Sullivan County, MOMO5,73842.1+8%

62DeKalb County, MOMO9,79542.2+12%

63Madison County, MOMO12,85842.2+8%

64Stoddard County, MOMO28,28442.2+8%

65Washington County, MOMO23,81042.2+20%

66Bates County, MOMO16,51242.3+10%

67Mississippi County, MOMO12,00342.3+13%

68Ray County, MOMO23,39842.3+14%

69Taney County, MOMO57,00142.3+9%

70Shelby County, MOMO5,87042.4+5%

71Clinton County, MOMO21,66142.4+12%

72New Madrid County, MOMO15,08642.6+14%

73Harrison County, MOMO8,28142.8+3%

74Dallas County, MOMO18,02542.9+13%

75Barry County, MOMO36,20043.1+13%

76Linn County, MOMO11,81543.1+7%

77Clark County, MOMO6,47543.5+11%

78Caldwell County, MOMO9,01243.5+12%

79Texas County, MOMO25,99443.5+8%

80Crawford County, MOMO22,92943.5+15%

81Cedar County, MOMO14,88843.5+3%

82Macon County, MOMO15,19043.6+9%

83Mercer County, MOMO3,40443.7+3%

84Ste. Genevieve County, MOMO18,68943.8+16%

85Knox County, MOMO3,72844.1+6%

86Henry County, MOMO22,67144.7+12%

87Ripley County, MOMO10,71744.8+14%

88Carroll County, MOMO8,41744.9+12%

89Dent County, MOMO14,58445.1+14%

90Montgomery County, MOMO11,59045.1+14%

91Maries County, MOMO8,39745.2+17%

92Bollinger County, MOMO10,64645.5+20%

93Monroe County, MOMO8,95945.5+15%

94Ralls County, MOMO10,44445.5+16%

95Putnam County, MOMO4,54645.7+9%

96Iron County, MOMO9,31845.9+16%

97Carter County, MOMO5,41846.0+18%

98Chariton County, MOMO7,37746.0+8%

99Atchison County, MOMO5,17546.1+11%

100Morgan County, MOMO22,41846.4+9%

101Gasconade County, MOMO14,78446.7+16%

102Reynolds County, MOMO5,99246.7+15%

103Shannon County, MOMO7,28547.4+22%

104Dade County, MOMO7,80447.5+14%

105Oregon County, MOMO8,70947.5+16%

106Douglas County, MOMO12,34247.8+19%

107Worth County, MOMO1,91447.8+14%

108Holt County, MOMO4,20048.4+16%

109St. Clair County, MOMO9,97648.4+10%

110Wayne County, MOMO10,78249.3+16%

111Camden County, MOMO44,04751.6+14%

112Ozark County, MOMO9,17251.9+19%

113Benton County, MOMO20,53653.8+16%

114Stone County, MOMO32,50354.0+22%

115Hickory County, MOMO9,04457.2+15%

SHOWING 1–115 OF 115

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