RANKING · 2010 CENSUS · 102 SHOWN OF 102

Youngest by median age, Illinois counties · 2010

Illinois counties with the youngest median age (2023 ACS). This list covers the 102 counties in Illinois 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

01Champaign County, ILIL209,97228.9+1%

02McDonough County, ILIL25,91628.9−0%

03Jackson County, ILIL52,50129.1+6%

04DeKalb County, ILIL101,83529.3+3%

05Coles County, ILIL46,60731.6+3%

06McLean County, ILIL171,41932.1+5%

07Kendall County, ILIL145,47032.9−4%

08Kane County, ILIL525,75734.5+7%

09Cook County, ILIL5,194,62535.3+5%

10Will County, ILIL712,25335.4+6%

11Grundy County, ILIL54,05236.1−1%

12Kankakee County, ILIL105,52536.7+4%

13Lake County, ILIL719,33936.7+9%

14Boone County, ILIL53,56836.8+7%

15Peoria County, ILIL178,55336.8+2%

16St. Clair County, ILIL250,70836.9+5%

17Brown County, ILIL6,40137.3+6%

18McHenry County, ILIL317,75138.0+11%

19DuPage County, ILIL934,29838.2+9%

20Winnebago County, ILIL283,67438.3+7%

21Madison County, ILIL263,11038.6+5%

22Cass County, ILIL12,46338.7+4%

23Douglas County, ILIL19,88038.7+3%

24Sangamon County, ILIL194,17039.2+5%

25Effingham County, ILIL34,51939.2+10%

26Clinton County, ILIL37,12839.3+7%

27Logan County, ILIL27,18239.4+6%

28Perry County, ILIL20,16039.4+5%

29Warren County, ILIL16,22239.6+5%

30Woodford County, ILIL38,11139.6+5%

31Lawrence County, ILIL13,79039.7−3%

32Bond County, ILIL16,95939.7+8%

33Tazewell County, ILIL130,04939.8+4%

34Vermilion County, ILIL71,25939.8+5%

35Fayette County, ILIL20,79039.9+6%

36Rock Island County, ILIL141,86940.0+6%

37Williamson County, ILIL67,22540.1+3%

38Macon County, ILIL99,30040.3+6%

39Moultrie County, ILIL14,37140.3+4%

40Jersey County, ILIL21,16040.5+9%

41Jefferson County, ILIL36,14740.6+8%

42Adams County, ILIL64,26740.7+6%

43Ogle County, ILIL51,39940.7+9%

44Livingston County, ILIL35,05740.8+9%

45Morgan County, ILIL32,51540.8+8%

46Cumberland County, ILIL10,20840.9+10%

47Monroe County, ILIL34,84041.0+9%

48LaSalle County, ILIL107,77341.0+8%

49Randolph County, ILIL29,92141.0+9%

50Alexander County, ILIL4,57041.1+8%

51Marion County, ILIL36,38241.4+8%

52Christian County, ILIL33,44341.6+7%

53Greene County, ILIL11,31341.6+10%

54Crawford County, ILIL18,64841.7+8%

55Saline County, ILIL22,77241.7+5%

56De Witt County, ILIL15,11841.7+8%

57Macoupin County, ILIL43,74841.7+7%

58Franklin County, ILIL36,91641.8+4%

59Henry County, ILIL48,09541.8+7%

60Whiteside County, ILIL54,12141.8+9%

61Fulton County, ILIL32,90141.9+7%

62Montgomery County, ILIL28,07641.9+10%

63Knox County, ILIL47,76742.0+7%

64Lee County, ILIL32,91442.0+11%

65Wabash County, ILIL10,90742.0+8%

66Massac County, ILIL13,50242.1+6%

67Richland County, ILIL15,21942.1+8%

68Clay County, ILIL12,79342.2+6%

69Johnson County, ILIL13,36342.2+15%

70Clark County, ILIL15,11442.3+8%

71Washington County, ILIL13,56442.3+9%

72Ford County, ILIL13,21642.4+8%

73Bureau County, ILIL32,51042.5+7%

74Pike County, ILIL14,23142.5+7%

75Menard County, ILIL11,86342.6+12%

76Piatt County, ILIL16,79142.6+8%

77Edwards County, ILIL5,89842.7+5%

78Jasper County, ILIL9,03242.7+12%

79Scott County, ILIL4,86642.7+10%

80Union County, ILIL16,65642.9+6%

81Wayne County, ILIL15,88242.9+8%

82Hamilton County, ILIL7,85943.1+6%

83Stephenson County, ILIL43,22043.1+12%

84Edgar County, ILIL16,32343.2+10%

85Pulaski County, ILIL4,82043.2+15%

86Iroquois County, ILIL26,15043.4+10%

87Shelby County, ILIL20,57643.5+11%

88Schuyler County, ILIL6,65743.6+7%

89Mercer County, ILIL15,22943.7+11%

90Stark County, ILIL5,31943.8+10%

91Mason County, ILIL12,41144.0+11%

92Gallatin County, ILIL4,61644.4+9%

93Calhoun County, ILIL4,30044.6+10%

94Hancock County, ILIL16,80344.6+11%

95Marshall County, ILIL11,47344.8+10%

96Putnam County, ILIL5,61945.2+14%

97White County, ILIL13,25045.2+8%

98Hardin County, ILIL3,58846.3+10%

99Carroll County, ILIL15,41946.5+14%

100Pope County, ILIL3,67246.6+13%

101Jo Daviess County, ILIL21,59447.1+13%

102Henderson County, ILIL5,98447.2+15%

SHOWING 1–102 OF 102

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