RANKING · 2020 CENSUS · 115 SHOWN OF 115

Youngest by median age, Missouri counties · 2020

Missouri counties with the youngest median age (2023 ACS). This list covers the 115 counties in Missouri that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDOldest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

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, MOMO6,38440.3+0%

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

Download CSV (full list, 115 rows)

UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES