RANKING · 1990 CENSUS · 102 SHOWN OF 102

Youngest by median age, Illinois counties · 1990

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

01Jackson County, ILIL52,50126.5−4%

02DeKalb County, ILIL101,83527.3−4%

03McDonough County, ILIL25,91627.4−5%

04Champaign County, ILIL209,97227.8−3%

05McLean County, ILIL171,41929.1−5%

06Coles County, ILIL46,60729.9−3%

07Kane County, ILIL525,75730.9−4%

08Will County, ILIL712,25331.2−6%

09Lake County, ILIL719,33931.7−6%

10Effingham County, ILIL34,51931.9−11%

11Kendall County, ILIL145,47032.2−6%

12St. Clair County, ILIL250,70832.2−9%

13McHenry County, ILIL317,75132.4−5%

14DuPage County, ILIL934,29832.4−8%

15Cook County, ILIL5,194,62532.8−3%

16Clinton County, ILIL37,12832.9−10%

17Kankakee County, ILIL105,52532.9−6%

18Boone County, ILIL53,56833.2−4%

19Jersey County, ILIL21,16033.2−11%

20Grundy County, ILIL54,05233.3−8%

21Brown County, ILIL6,40133.5−5%

22Winnebago County, ILIL283,67433.5−7%

23Cumberland County, ILIL10,20833.8−9%

24Peoria County, ILIL178,55333.9−6%

25Ogle County, ILIL51,39934.0−9%

26Madison County, ILIL263,11034.0−8%

27Monroe County, ILIL34,84034.0−9%

28Randolph County, ILIL29,92134.0−10%

29Woodford County, ILIL38,11134.1−10%

30Livingston County, ILIL35,05734.3−8%

31Sangamon County, ILIL194,17034.3−8%

32Lee County, ILIL32,91434.3−9%

33Morgan County, ILIL32,51534.5−9%

34Douglas County, ILIL19,88034.5−8%

35Jasper County, ILIL9,03234.5−9%

36Logan County, ILIL27,18234.6−6%

37Alexander County, ILIL4,57034.7−9%

38Tazewell County, ILIL130,04934.8−9%

39Whiteside County, ILIL54,12134.8−10%

40Jefferson County, ILIL36,14734.9−7%

41Pulaski County, ILIL4,82034.9−7%

42Wabash County, ILIL10,90735.0−10%

43Rock Island County, ILIL141,86935.0−8%

44Stephenson County, ILIL43,22035.0−9%

45Macon County, ILIL99,30035.0−8%

46Bond County, ILIL16,95935.0−5%

47Marion County, ILIL36,38235.1−9%

48Warren County, ILIL16,22235.2−7%

49Fayette County, ILIL20,79035.3−6%

50Montgomery County, ILIL28,07635.3−7%

51De Witt County, ILIL15,11835.4−8%

52Perry County, ILIL20,16035.4−6%

53Menard County, ILIL11,86335.4−7%

54LaSalle County, ILIL107,77335.5−7%

55Vermilion County, ILIL71,25935.5−7%

56Johnson County, ILIL13,36335.5−3%

57Richland County, ILIL15,21935.6−9%

58Pope County, ILIL3,67235.6−13%

59Cass County, ILIL12,46335.8−4%

60Adams County, ILIL64,26735.8−7%

61Washington County, ILIL13,56435.9−7%

62Henry County, ILIL48,09535.9−8%

63Scott County, ILIL4,86635.9−7%

64Putnam County, ILIL5,61935.9−9%

65Macoupin County, ILIL43,74836.0−8%

66Greene County, ILIL11,31336.0−5%

67Piatt County, ILIL16,79136.1−9%

68Mercer County, ILIL15,22936.1−9%

69Williamson County, ILIL67,22536.1−7%

70Shelby County, ILIL20,57636.2−8%

71Jo Daviess County, ILIL21,59436.2−13%

72Bureau County, ILIL32,51036.2−9%

73Knox County, ILIL47,76736.3−8%

74Christian County, ILIL33,44336.4−6%

75Mason County, ILIL12,41136.5−8%

76Ford County, ILIL13,21636.6−7%

77Moultrie County, ILIL14,37136.7−5%

78Clay County, ILIL12,79336.8−7%

79Clark County, ILIL15,11436.9−6%

80Fulton County, ILIL32,90136.9−6%

81Crawford County, ILIL18,64837.0−4%

82Iroquois County, ILIL26,15037.1−6%

83Wayne County, ILIL15,88237.3−7%

84Hardin County, ILIL3,58837.3−11%

85Carroll County, ILIL15,41937.4−8%

86Hancock County, ILIL16,80337.4−7%

87Edwards County, ILIL5,89837.5−7%

88Edgar County, ILIL16,32337.5−5%

89Henderson County, ILIL5,98437.6−8%

90Marshall County, ILIL11,47337.6−8%

91Pike County, ILIL14,23137.7−5%

92Schuyler County, ILIL6,65737.7−8%

93Lawrence County, ILIL13,79037.8−7%

94Stark County, ILIL5,31937.8−5%

95Massac County, ILIL13,50237.9−4%

96Union County, ILIL16,65638.0−6%

97Franklin County, ILIL36,91638.0−6%

98Calhoun County, ILIL4,30038.3−5%

99White County, ILIL13,25038.3−9%

100Saline County, ILIL22,77238.3−4%

101Hamilton County, ILIL7,85939.5−3%

102Gallatin County, ILIL4,61640.0−2%

SHOWING 1–102 OF 102

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