RANKING · 2020 CENSUS · 102 SHOWN OF 102

Youngest by median age, Illinois counties · 2020

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, ILIL209,97230.8+8%

02DeKalb County, ILIL101,83534.3+21%

03Jackson County, ILIL52,50134.9+27%

04McLean County, ILIL171,41935.1+15%

05Kendall County, ILIL145,47035.8+5%

06McDonough County, ILIL25,91637.0+28%

07Cook County, ILIL5,194,62537.4+11%

08Kane County, ILIL525,75738.3+19%

09Peoria County, ILIL178,55338.5+7%

10Grundy County, ILIL54,05238.7+7%

11Coles County, ILIL46,60738.8+26%

12Cass County, ILIL12,46339.0+5%

13Will County, ILIL712,25339.0+17%

14St. Clair County, ILIL250,70839.3+11%

15Lake County, ILIL719,33939.3+16%

16Douglas County, ILIL19,88039.6+6%

17Kankakee County, ILIL105,52539.6+12%

18Boone County, ILIL53,56839.9+16%

19Winnebago County, ILIL283,67440.0+11%

20DuPage County, ILIL934,29840.1+14%

21Brown County, ILIL6,40140.1+14%

22Madison County, ILIL263,11040.3+9%

23Effingham County, ILIL34,51940.5+13%

24Rock Island County, ILIL141,86940.6+7%

25McHenry County, ILIL317,75140.8+19%

26Warren County, ILIL16,22240.9+8%

27Sangamon County, ILIL194,17041.1+10%

28Moultrie County, ILIL14,37141.1+6%

29Woodford County, ILIL38,11141.1+9%

30Clinton County, ILIL37,12841.3+13%

31Adams County, ILIL64,26741.3+8%

32Macon County, ILIL99,30041.3+9%

33Lawrence County, ILIL13,79041.4+1%

34Fayette County, ILIL20,79041.4+10%

35Bond County, ILIL16,95941.7+13%

36Vermilion County, ILIL71,25941.7+10%

37Logan County, ILIL27,18241.9+13%

38Ogle County, ILIL51,39941.9+13%

39Tazewell County, ILIL130,04941.9+10%

40Williamson County, ILIL67,22541.9+8%

41Perry County, ILIL20,16042.0+12%

42Jefferson County, ILIL36,14742.2+12%

43Livingston County, ILIL35,05742.4+14%

44LaSalle County, ILIL107,77342.5+12%

45Morgan County, ILIL32,51542.5+12%

46Marion County, ILIL36,38242.7+11%

47Monroe County, ILIL34,84042.8+14%

48Cumberland County, ILIL10,20842.8+15%

49Johnson County, ILIL13,36342.8+17%

50Wayne County, ILIL15,88242.8+7%

51Clay County, ILIL12,79342.9+8%

52Ford County, ILIL13,21642.9+9%

53Pike County, ILIL14,23143.0+8%

54Crawford County, ILIL18,64843.1+12%

55Randolph County, ILIL29,92143.1+15%

56Wabash County, ILIL10,90743.1+11%

57Saline County, ILIL22,77243.2+8%

58Hamilton County, ILIL7,85943.2+6%

59Henry County, ILIL48,09543.2+10%

60Richland County, ILIL15,21943.2+10%

61Knox County, ILIL47,76743.3+10%

62Clark County, ILIL15,11443.4+11%

63Christian County, ILIL33,44343.5+12%

64De Witt County, ILIL15,11843.6+13%

65Edwards County, ILIL5,89843.6+8%

66Menard County, ILIL11,86343.6+15%

67Lee County, ILIL32,91443.7+15%

68Montgomery County, ILIL28,07643.7+15%

69Piatt County, ILIL16,79143.7+10%

70Franklin County, ILIL36,91644.1+9%

71Jasper County, ILIL9,03244.1+16%

72Fulton County, ILIL32,90144.2+13%

73Jersey County, ILIL21,16044.2+18%

74Greene County, ILIL11,31344.3+17%

75Massac County, ILIL13,50244.3+12%

76Macoupin County, ILIL43,74844.4+14%

77Scott County, ILIL4,86644.4+14%

78Washington County, ILIL13,56444.4+14%

79Whiteside County, ILIL54,12144.4+15%

80Iroquois County, ILIL26,15044.5+12%

81Bureau County, ILIL32,51044.8+13%

82Union County, ILIL16,65644.9+11%

83Mercer County, ILIL15,22945.1+14%

84White County, ILIL13,25045.1+7%

85Shelby County, ILIL20,57645.4+16%

86Edgar County, ILIL16,32345.5+16%

87Stark County, ILIL5,31945.5+14%

88Stephenson County, ILIL43,22045.9+19%

89Pulaski County, ILIL4,82046.0+22%

90Hancock County, ILIL16,80346.1+14%

91Mason County, ILIL12,41146.1+17%

92Marshall County, ILIL11,47346.2+13%

93Carroll County, ILIL15,41946.5+14%

94Putnam County, ILIL5,61947.0+19%

95Gallatin County, ILIL4,61647.3+16%

96Schuyler County, ILIL6,65747.5+16%

97Calhoun County, ILIL4,30049.0+21%

98Alexander County, ILIL4,57049.1+29%

99Henderson County, ILIL5,98450.1+22%

100Jo Daviess County, ILIL21,59450.1+20%

101Hardin County, ILIL3,58852.2+24%

102Pope County, ILIL3,67252.5+28%

SHOWING 1–102 OF 102

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