RANKING · 1990 CENSUS · 115 SHOWN OF 115

Youngest by median age, Missouri counties · 1990

Missouri counties with the youngest median age (1990 ACS). This list covers the 115 counties in Missouri that qualify, ranked against each other statewide. The median across all 115 is 35.8.

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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 –

01Johnson County, MOMO56,67026.2–

02Pulaski County, MOMO54,44227.0–

03Adair County, MOMO25,68427.3–

04Boone County, MOMO191,74627.8–

05Nodaway County, MOMO20,17428.1–

06St. Charles County, MOMO426,49930.7–

07Jefferson County, MOMO233,13230.7–

08Lincoln County, MOMO66,67631.8–

09Phelps County, MOMO45,24731.9–

10Washington County, MOMO23,81031.9–

11Cape Girardeau County, MOMO83,99932.2–

12Cass County, MOMO115,85932.3–

13Osage County, MOMO13,61132.3–

14Franklin County, MOMO108,09032.3–

15Pemiscot County, MOMO14,46532.6–

16Callaway County, MOMO45,76532.6–

17Greene County, MOMO309,28632.6–

18Christian County, MOMO96,72532.7–

19Webster County, MOMO43,05432.8–

20Platte County, MOMO114,40032.8–

21Cole County, MOMO77,90832.8–

22St. Louis, MOMO278,14432.9–

23Clay County, MOMO265,03232.9–

24Jackson County, MOMO732,99433.2–

25Scott County, MOMO37,97533.2–

26Polk County, MOMO33,60433.4–

27New Madrid County, MOMO15,08633.5–

28DeKalb County, MOMO9,79533.6–

29Warren County, MOMO39,01633.7–

30Ste. Genevieve County, MOMO18,68933.9–

31McDonald County, MOMO23,99234.0–

32Mississippi County, MOMO12,00334.1–

33Buchanan County, MOMO83,54034.1–

34Lewis County, MOMO9,87934.1–

35Cooper County, MOMO17,13634.1–

36Ray County, MOMO23,39834.1–

37Miller County, MOMO25,81734.1–

38Jasper County, MOMO127,42834.2–

39Moniteau County, MOMO15,42834.2–

40Laclede County, MOMO36,94334.3–

41St. Francois County, MOMO67,80934.4–

42Randolph County, MOMO24,51334.5–

43Perry County, MOMO19,09334.5–

44Newton County, MOMO62,26334.6–

45St. Louis County, MOMO990,91134.7–

46Pettis County, MOMO44,25434.7–

47Marion County, MOMO28,52534.8–

48Clinton County, MOMO21,66135.1–

49Wright County, MOMO19,67135.1–

50Howard County, MOMO10,18035.1–

51Andrew County, MOMO18,24135.2–

52Lafayette County, MOMO33,53135.4–

53Saline County, MOMO23,26535.4–

54Crawford County, MOMO22,92935.5–

55Vernon County, MOMO19,94635.6–

56Lawrence County, MOMO39,40135.6–

57Shannon County, MOMO7,28535.7–

58Carter County, MOMO5,41835.8–

59Pike County, MOMO17,95535.8–

60Butler County, MOMO41,90435.8–

61Clark County, MOMO6,47535.9–

62Monroe County, MOMO8,95936.0–

63Bollinger County, MOMO10,64636.0–

64Dunklin County, MOMO26,85536.1–

65Howell County, MOMO40,79836.4–

66Barton County, MOMO11,79536.4–

67Texas County, MOMO25,99436.5–

68Madison County, MOMO12,85836.6–

69Maries County, MOMO8,39736.6–

70Ralls County, MOMO10,44436.6–

71Dallas County, MOMO18,02536.6–

72Stoddard County, MOMO28,28436.8–

73Ripley County, MOMO10,71737.0–

74Montgomery County, MOMO11,59037.0–

75Livingston County, MOMO14,70837.1–

76Reynolds County, MOMO5,99237.1–

77Audrain County, MOMO24,52837.1–

78Douglas County, MOMO12,34237.2–

79Iron County, MOMO9,31837.3–

80Bates County, MOMO16,51237.3–

81Caldwell County, MOMO9,01237.5–

82Daviess County, MOMO8,55837.5–

83Dent County, MOMO14,58437.6–

84Barry County, MOMO36,20037.6–

85Gasconade County, MOMO14,78438.0–

86Atchison County, MOMO5,17538.1–

87Carroll County, MOMO8,41738.2–

88Henry County, MOMO22,67138.3–

89Holt County, MOMO4,20038.4–

90Macon County, MOMO15,19038.4–

91Dade County, MOMO7,80438.7–

92Scotland County, MOMO4,79638.9–

93Chariton County, MOMO7,37738.9–

94Schuyler County, MOMO4,14038.9–

95Linn County, MOMO11,81539.0–

96Shelby County, MOMO5,87039.5–

97Grundy County, MOMO9,74439.5–

98Gentry County, MOMO6,38439.8–

99Wayne County, MOMO10,78240.1–

100Taney County, MOMO57,00140.5–

101Oregon County, MOMO8,70940.7–

102Knox County, MOMO3,72841.0–

103Camden County, MOMO44,04741.6–

104Ozark County, MOMO9,17241.8–

105Cedar County, MOMO14,88842.0–

106Morgan County, MOMO22,41842.1–

107Putnam County, MOMO4,54642.2–

108Sullivan County, MOMO5,73842.2–

109Harrison County, MOMO8,28142.3–

110St. Clair County, MOMO9,97642.3–

111Stone County, MOMO32,50342.6–

112Worth County, MOMO1,91442.8–

113Mercer County, MOMO3,40442.9–

114Benton County, MOMO20,53644.6–

115Hickory County, MOMO9,04450.8–

SHOWING 1–115 OF 115

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