RANKING · 2024 ACS · 102 SHOWN OF 102

Youngest by median age, Illinois counties

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, ILIL209,97230.7+7%

02Jackson County, ILIL52,50132.4+18%

03DeKalb County, ILIL101,83532.7+15%

04McLean County, ILIL171,41934.3+12%

05McDonough County, ILIL25,91634.9+20%

06Kendall County, ILIL145,47036.3+6%

07Coles County, ILIL46,60737.5+22%

08Cook County, ILIL5,194,62538.0+13%

09Peoria County, ILIL178,55338.1+6%

10Cass County, ILIL12,46338.3+3%

11Grundy County, ILIL54,05238.3+6%

12Warren County, ILIL16,22238.5+2%

13Douglas County, ILIL19,88038.7+3%

14Kane County, ILIL525,75738.8+20%

15Kankakee County, ILIL105,52539.0+11%

16Lake County, ILIL719,33939.1+16%

17Will County, ILIL712,25339.1+17%

18Winnebago County, ILIL283,67439.6+10%

19Bond County, ILIL16,95939.7+8%

20Boone County, ILIL53,56839.7+15%

21St. Clair County, ILIL250,70839.9+13%

22Effingham County, ILIL34,51940.0+12%

23Moultrie County, ILIL14,37140.1+4%

24DuPage County, ILIL934,29840.2+14%

25Madison County, ILIL263,11040.2+9%

26Rock Island County, ILIL141,86940.3+7%

27Clay County, ILIL12,79340.4+2%

28Woodford County, ILIL38,11140.4+7%

29Macon County, ILIL99,30040.6+7%

30Lawrence County, ILIL13,79040.7−0%

31McHenry County, ILIL317,75140.7+19%

32Sangamon County, ILIL194,17041.0+10%

33Brown County, ILIL6,40141.0+16%

34Logan County, ILIL27,18241.1+11%

35Morgan County, ILIL32,51541.1+9%

36Jefferson County, ILIL36,14741.2+10%

37Vermilion County, ILIL71,25941.3+9%

38Adams County, ILIL64,26741.4+8%

39Johnson County, ILIL13,36341.4+13%

40Clinton County, ILIL37,12841.5+13%

41Marion County, ILIL36,38241.5+8%

42Williamson County, ILIL67,22541.6+7%

43Livingston County, ILIL35,05741.8+12%

44Fayette County, ILIL20,79041.9+12%

45Ford County, ILIL13,21641.9+6%

46Tazewell County, ILIL130,04941.9+10%

47Perry County, ILIL20,16042.0+12%

48LaSalle County, ILIL107,77342.2+11%

49Ogle County, ILIL51,39942.2+13%

50Richland County, ILIL15,21942.3+8%

51Crawford County, ILIL18,64842.6+10%

52Clark County, ILIL15,11442.6+9%

53Knox County, ILIL47,76742.6+8%

54Menard County, ILIL11,86342.8+13%

55Montgomery County, ILIL28,07642.8+12%

56Piatt County, ILIL16,79142.8+8%

57Wayne County, ILIL15,88242.8+7%

58Pike County, ILIL14,23143.0+8%

59Pulaski County, ILIL4,82043.0+14%

60Whiteside County, ILIL54,12143.0+12%

61Cumberland County, ILIL10,20843.1+16%

62Lee County, ILIL32,91443.1+14%

63Monroe County, ILIL34,84043.2+15%

64Christian County, ILIL33,44343.2+11%

65Wabash County, ILIL10,90743.2+11%

66Franklin County, ILIL36,91643.4+8%

67Greene County, ILIL11,31343.4+15%

68Henry County, ILIL48,09543.6+12%

69De Witt County, ILIL15,11843.7+14%

70Jersey County, ILIL21,16043.7+17%

71Randolph County, ILIL29,92143.7+16%

72Saline County, ILIL22,77243.8+10%

73Fulton County, ILIL32,90143.9+12%

74Hamilton County, ILIL7,85943.9+8%

75Bureau County, ILIL32,51044.1+11%

76Macoupin County, ILIL43,74844.2+14%

77Washington County, ILIL13,56444.2+14%

78Jasper County, ILIL9,03244.3+16%

79Union County, ILIL16,65644.3+10%

80White County, ILIL13,25044.3+5%

81Iroquois County, ILIL26,15044.4+12%

82Stark County, ILIL5,31944.4+11%

83Edwards County, ILIL5,89844.7+10%

84Massac County, ILIL13,50244.7+13%

85Mercer County, ILIL15,22944.7+13%

86Shelby County, ILIL20,57645.3+15%

87Stephenson County, ILIL43,22045.3+18%

88Carroll County, ILIL15,41945.4+11%

89Mason County, ILIL12,41145.4+15%

90Scott County, ILIL4,86646.0+19%

91Marshall County, ILIL11,47346.1+13%

92Edgar County, ILIL16,32346.6+19%

93Gallatin County, ILIL4,61646.7+15%

94Hancock County, ILIL16,80346.9+16%

95Putnam County, ILIL5,61947.4+20%

96Alexander County, ILIL4,57048.0+26%

97Calhoun County, ILIL4,30048.8+20%

98Schuyler County, ILIL6,65749.1+20%

99Henderson County, ILIL5,98450.2+22%

100Jo Daviess County, ILIL21,59451.5+24%

101Hardin County, ILIL3,58853.6+27%

102Pope County, ILIL3,67253.9+31%

SHOWING 1–102 OF 102

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