RANKING · 1990 CENSUS · 115 SHOWN OF 115

Youngest by median age, Missouri counties · 1990

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

01Johnson County, MOMO56,67026.2−8%

02Pulaski County, MOMO54,44227.0−5%

03Adair County, MOMO25,68427.3−2%

04Boone County, MOMO191,74627.8−6%

05Nodaway County, MOMO20,17428.1−7%

06St. Charles County, MOMO426,49930.7−10%

07Jefferson County, MOMO233,13230.7−12%

08Lincoln County, MOMO66,67631.8−8%

09Phelps County, MOMO45,24731.9−9%

10Washington County, MOMO23,81031.9−9%

11Cape Girardeau County, MOMO83,99932.2−8%

12Cass County, MOMO115,85932.3−10%

13Osage County, MOMO13,61132.3−10%

14Franklin County, MOMO108,09032.3−10%

15Pemiscot County, MOMO14,46532.6−5%

16Callaway County, MOMO45,76532.6−6%

17Greene County, MOMO309,28632.6−7%

18Christian County, MOMO96,72532.7−5%

19Webster County, MOMO43,05432.8−5%

20Platte County, MOMO114,40032.8−9%

21Cole County, MOMO77,90832.8−8%

22St. Louis, MOMO278,14432.9−2%

23Clay County, MOMO265,03232.9−6%

24Jackson County, MOMO732,99433.2−6%

25Scott County, MOMO37,97533.2−8%

26Polk County, MOMO33,60433.4−5%

27New Madrid County, MOMO15,08633.5−10%

28DeKalb County, MOMO9,79533.6−11%

29Warren County, MOMO39,01633.7−10%

30Ste. Genevieve County, MOMO18,68933.9−10%

31McDonald County, MOMO23,99234.0−1%

32Mississippi County, MOMO12,00334.1−9%

33Buchanan County, MOMO83,54034.1−6%

34Lewis County, MOMO9,87934.1−5%

35Cooper County, MOMO17,13634.1−3%

36Ray County, MOMO23,39834.1−8%

37Miller County, MOMO25,81734.1−8%

38Jasper County, MOMO127,42834.2−2%

39Moniteau County, MOMO15,42834.2−5%

40Laclede County, MOMO36,94334.3−6%

41St. Francois County, MOMO67,80934.4−8%

42Randolph County, MOMO24,51334.5−7%

43Perry County, MOMO19,09334.5−6%

44Newton County, MOMO62,26334.6−7%

45St. Louis County, MOMO990,91134.7−8%

46Pettis County, MOMO44,25434.7−5%

47Marion County, MOMO28,52534.8−6%

48Clinton County, MOMO21,66135.1−7%

49Wright County, MOMO19,67135.1−7%

50Howard County, MOMO10,18035.1−4%

51Andrew County, MOMO18,24135.2−7%

52Lafayette County, MOMO33,53135.4−7%

53Saline County, MOMO23,26535.4−5%

54Crawford County, MOMO22,92935.5−6%

55Vernon County, MOMO19,94635.6−4%

56Lawrence County, MOMO39,40135.6−3%

57Shannon County, MOMO7,28535.7−8%

58Carter County, MOMO5,41835.8−8%

59Pike County, MOMO17,95535.8−5%

60Butler County, MOMO41,90435.8−7%

61Clark County, MOMO6,47535.9−8%

62Monroe County, MOMO8,95936.0−9%

63Bollinger County, MOMO10,64636.0−5%

64Dunklin County, MOMO26,85536.1−5%

65Howell County, MOMO40,79836.4−5%

66Barton County, MOMO11,79536.4−2%

67Texas County, MOMO25,99436.5−10%

68Madison County, MOMO12,85836.6−6%

69Maries County, MOMO8,39736.6−5%

70Ralls County, MOMO10,44436.6−7%

71Dallas County, MOMO18,02536.6−3%

72Stoddard County, MOMO28,28436.8−6%

73Ripley County, MOMO10,71737.0−6%

74Montgomery County, MOMO11,59037.0−6%

75Livingston County, MOMO14,70837.1−7%

76Reynolds County, MOMO5,99237.1−9%

77Audrain County, MOMO24,52837.1−2%

78Douglas County, MOMO12,34237.2−7%

79Iron County, MOMO9,31837.3−6%

80Bates County, MOMO16,51237.3−3%

81Caldwell County, MOMO9,01237.5−3%

82Daviess County, MOMO8,55837.5−4%

83Dent County, MOMO14,58437.6−5%

84Barry County, MOMO36,20037.6−2%

85Gasconade County, MOMO14,78438.0−6%

86Atchison County, MOMO5,17538.1−9%

87Carroll County, MOMO8,41738.2−4%

88Henry County, MOMO22,67138.3−4%

89Holt County, MOMO4,20038.4−8%

90Macon County, MOMO15,19038.4−4%

91Dade County, MOMO7,80438.7−7%

92Scotland County, MOMO4,79638.9+4%

93Chariton County, MOMO7,37738.9−9%

94Schuyler County, MOMO4,14038.9−5%

95Linn County, MOMO11,81539.0−3%

96Shelby County, MOMO5,87039.5−2%

97Grundy County, MOMO9,74439.5−4%

98Gentry County, MOMO6,38439.8−1%

99Wayne County, MOMO10,78240.1−6%

100Taney County, MOMO57,00140.5+5%

101Oregon County, MOMO8,70940.7−1%

102Knox County, MOMO3,72841.0−1%

103Camden County, MOMO44,04741.6−8%

104Ozark County, MOMO9,17241.8−4%

105Cedar County, MOMO14,88842.0−1%

106Morgan County, MOMO22,41842.1−1%

107Putnam County, MOMO4,54642.2+1%

108Sullivan County, MOMO5,73842.2+8%

109Harrison County, MOMO8,28142.3+2%

110St. Clair County, MOMO9,97642.3−4%

111Stone County, MOMO32,50342.6−3%

112Worth County, MOMO1,91442.8+2%

113Mercer County, MOMO3,40442.9+1%

114Benton County, MOMO20,53644.6−4%

115Hickory County, MOMO9,04450.8+2%

SHOWING 1–115 OF 115

Download CSV (full list, 115 rows)

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