RANKING · 2010 CENSUS · 115 SHOWN OF 115

Youngest by median age, Missouri counties · 2010

Missouri counties with the youngest median age (2010 ACS). This list covers the 115 counties in Missouri that qualify, ranked against each other statewide. The median across all 115 is 40.6.

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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, MOMO54,44226.6−7%

02Adair County, MOMO25,68428.3+1%

03Nodaway County, MOMO20,17428.5−6%

04Boone County, MOMO191,74629.60%

05Johnson County, MOMO56,67029.8+5%

06Phelps County, MOMO45,24733.8−3%

07St. Louis, MOMO278,14433.9+1%

08Jasper County, MOMO127,42835.1+1%

09Lincoln County, MOMO66,67635.6+3%

10Greene County, MOMO309,28635.8+2%

11Jackson County, MOMO732,99436.2+3%

12Clay County, MOMO265,03236.2+3%

13Christian County, MOMO96,72536.3+5%

14Cape Girardeau County, MOMO83,99936.4+3%

15McDonald County, MOMO23,99236.5+6%

16Buchanan County, MOMO83,54036.9+2%

17St. Charles County, MOMO426,49936.9+8%

18Pemiscot County, MOMO14,46537.0+8%

19Pettis County, MOMO44,25437.1+2%

20Webster County, MOMO43,05437.5+8%

21Cole County, MOMO77,90837.7+6%

22Callaway County, MOMO45,76537.7+9%

23Jefferson County, MOMO233,13237.8+8%

24Moniteau County, MOMO15,42837.8+5%

25Polk County, MOMO33,60437.8+8%

26Cass County, MOMO115,85937.9+6%

27Randolph County, MOMO24,51338.0+2%

28St. Francois County, MOMO67,80938.2+3%

29Saline County, MOMO23,26538.2+3%

30Platte County, MOMO114,40038.4+7%

31Audrain County, MOMO24,52838.5+1%

32Cooper County, MOMO17,13638.7+10%

33Lewis County, MOMO9,87938.7+8%

34Scott County, MOMO37,97538.9+8%

35Marion County, MOMO28,52539.0+5%

36Newton County, MOMO62,26339.0+5%

37Lawrence County, MOMO39,40139.1+6%

38Scotland County, MOMO4,79639.1+5%

39Howard County, MOMO10,18039.2+7%

40Perry County, MOMO19,09339.2+7%

41Washington County, MOMO23,81039.2+11%

42Dunklin County, MOMO26,85539.3+4%

43Laclede County, MOMO36,94339.3+7%

44Osage County, MOMO13,61139.3+9%

45Franklin County, MOMO108,09039.4+10%

46Mississippi County, MOMO12,00339.4+6%

47Warren County, MOMO39,01639.5+6%

48Howell County, MOMO40,79839.6+4%

49DeKalb County, MOMO9,79539.9+6%

50Pike County, MOMO17,95539.9+6%

51St. Louis County, MOMO990,91139.9+6%

52Vernon County, MOMO19,94640.0+8%

53Daviess County, MOMO8,55840.1+3%

54Miller County, MOMO25,81740.2+8%

55Barton County, MOMO11,79540.3+8%

56New Madrid County, MOMO15,08640.4+8%

57Butler County, MOMO41,90440.6+5%

58Ray County, MOMO23,39840.6+9%

59Crawford County, MOMO22,92940.6+7%

60Lafayette County, MOMO33,53140.6+7%

61Taney County, MOMO57,00140.7+5%

62Wright County, MOMO19,67140.7+8%

63Sullivan County, MOMO5,73840.8+5%

64Clinton County, MOMO21,66140.8+8%

65Andrew County, MOMO18,24141.0+8%

66Madison County, MOMO12,85841.0+5%

67Livingston County, MOMO14,70841.1+4%

68Stoddard County, MOMO28,28441.1+5%

69Carter County, MOMO5,41841.2+6%

70Bates County, MOMO16,51241.3+8%

71Caldwell County, MOMO9,01241.3+6%

72Schuyler County, MOMO4,14041.3+1%

73Dallas County, MOMO18,02541.4+9%

74Grundy County, MOMO9,74441.6+1%

75Barry County, MOMO36,20041.8+9%

76Bollinger County, MOMO10,64642.0+11%

77Carroll County, MOMO8,41742.1+5%

78Ripley County, MOMO10,71742.1+7%

79Texas County, MOMO25,99442.1+4%

80Linn County, MOMO11,81542.2+5%

81Clark County, MOMO6,47542.3+8%

82Macon County, MOMO15,19042.3+5%

83Shelby County, MOMO5,87042.3+5%

84Gentry County, MOMO6,38442.4+5%

85Harrison County, MOMO8,28142.6+2%

86Ste. Genevieve County, MOMO18,68942.6+13%

87Iron County, MOMO9,31842.7+8%

88Maries County, MOMO8,39742.8+11%

89Dent County, MOMO14,58443.0+9%

90Montgomery County, MOMO11,59043.2+10%

91Ralls County, MOMO10,44443.4+10%

92Shannon County, MOMO7,28543.4+12%

93Henry County, MOMO22,67143.5+9%

94Mercer County, MOMO3,40443.5+3%

95Knox County, MOMO3,72843.6+5%

96Monroe County, MOMO8,95943.8+11%

97Reynolds County, MOMO5,99244.6+10%

98Cedar County, MOMO14,88844.9+6%

99Douglas County, MOMO12,34245.0+12%

100Gasconade County, MOMO14,78445.0+12%

101Putnam County, MOMO4,54645.1+8%

102Oregon County, MOMO8,70945.4+11%

103Chariton County, MOMO7,37745.8+8%

104Wayne County, MOMO10,78245.8+8%

105Dade County, MOMO7,80445.9+10%

106Morgan County, MOMO22,41846.1+8%

107Atchison County, MOMO5,17546.2+11%

108Holt County, MOMO4,20046.6+11%

109Worth County, MOMO1,91447.4+13%

110St. Clair County, MOMO9,97648.1+10%

111Camden County, MOMO44,04748.6+8%

112Ozark County, MOMO9,17248.9+12%

113Stone County, MOMO32,50349.9+13%

114Benton County, MOMO20,53651.5+11%

115Hickory County, MOMO9,04453.0+7%

SHOWING 1–115 OF 115

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