RANKING · 1990 CENSUS · 102 SHOWN OF 102

Oldest by median age, Illinois counties · 1990

Illinois counties ranked by median age of residents (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

RELATEDYoungest 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

01Gallatin County, ILIL4,61640.0−2%

02Hamilton County, ILIL7,85939.5−3%

03Saline County, ILIL22,77238.3−4%

04White County, ILIL13,25038.3−9%

05Calhoun County, ILIL4,30038.3−5%

06Franklin County, ILIL36,91638.0−6%

07Union County, ILIL16,65638.0−6%

08Massac County, ILIL13,50237.9−4%

09Stark County, ILIL5,31937.8−5%

10Lawrence County, ILIL13,79037.8−7%

11Schuyler County, ILIL6,65737.7−8%

12Pike County, ILIL14,23137.7−5%

13Marshall County, ILIL11,47337.6−8%

14Henderson County, ILIL5,98437.6−8%

15Edgar County, ILIL16,32337.5−5%

16Edwards County, ILIL5,89837.5−7%

17Hancock County, ILIL16,80337.4−7%

18Carroll County, ILIL15,41937.4−8%

19Hardin County, ILIL3,58837.3−11%

20Wayne County, ILIL15,88237.3−7%

21Iroquois County, ILIL26,15037.1−6%

22Crawford County, ILIL18,64837.0−4%

23Fulton County, ILIL32,90136.9−6%

24Clark County, ILIL15,11436.9−6%

25Clay County, ILIL12,79336.8−7%

26Moultrie County, ILIL14,37136.7−5%

27Ford County, ILIL13,21636.6−7%

28Mason County, ILIL12,41136.5−8%

29Christian County, ILIL33,44336.4−6%

30Knox County, ILIL47,76736.3−8%

31Bureau County, ILIL32,51036.2−9%

32Jo Daviess County, ILIL21,59436.2−13%

33Shelby County, ILIL20,57636.2−8%

34Williamson County, ILIL67,22536.1−7%

35Mercer County, ILIL15,22936.1−9%

36Piatt County, ILIL16,79136.1−9%

37Greene County, ILIL11,31336.0−5%

38Macoupin County, ILIL43,74836.0−8%

39Putnam County, ILIL5,61935.9−9%

40Scott County, ILIL4,86635.9−7%

41Henry County, ILIL48,09535.9−8%

42Washington County, ILIL13,56435.9−7%

43Adams County, ILIL64,26735.8−7%

44Cass County, ILIL12,46335.8−4%

45Pope County, ILIL3,67235.6−13%

46Richland County, ILIL15,21935.6−9%

47Johnson County, ILIL13,36335.5−3%

48Vermilion County, ILIL71,25935.5−7%

49LaSalle County, ILIL107,77335.5−7%

50Menard County, ILIL11,86335.4−7%

51Perry County, ILIL20,16035.4−6%

52De Witt County, ILIL15,11835.4−8%

53Montgomery County, ILIL28,07635.3−7%

54Fayette County, ILIL20,79035.3−6%

55Warren County, ILIL16,22235.2−7%

56Marion County, ILIL36,38235.1−9%

57Bond County, ILIL16,95935.0−5%

58Macon County, ILIL99,30035.0−8%

59Stephenson County, ILIL43,22035.0−9%

60Rock Island County, ILIL141,86935.0−8%

61Wabash County, ILIL10,90735.0−10%

62Pulaski County, ILIL4,82034.9−7%

63Jefferson County, ILIL36,14734.9−7%

64Whiteside County, ILIL54,12134.8−10%

65Tazewell County, ILIL130,04934.8−9%

66Alexander County, ILIL4,57034.7−9%

67Logan County, ILIL27,18234.6−6%

68Jasper County, ILIL9,03234.5−9%

69Douglas County, ILIL19,88034.5−8%

70Morgan County, ILIL32,51534.5−9%

71Lee County, ILIL32,91434.3−9%

72Sangamon County, ILIL194,17034.3−8%

73Livingston County, ILIL35,05734.3−8%

74Woodford County, ILIL38,11134.1−10%

75Randolph County, ILIL29,92134.0−10%

76Monroe County, ILIL34,84034.0−9%

77Madison County, ILIL263,11034.0−8%

78Ogle County, ILIL51,39934.0−9%

79Peoria County, ILIL178,55333.9−6%

80Cumberland County, ILIL10,20833.8−9%

81Winnebago County, ILIL283,67433.5−7%

82Brown County, ILIL6,40133.5−5%

83Grundy County, ILIL54,05233.3−8%

84Jersey County, ILIL21,16033.2−11%

85Boone County, ILIL53,56833.2−4%

86Kankakee County, ILIL105,52532.9−6%

87Clinton County, ILIL37,12832.9−10%

88Cook County, ILIL5,194,62532.8−3%

89DuPage County, ILIL934,29832.4−8%

90McHenry County, ILIL317,75132.4−5%

91St. Clair County, ILIL250,70832.2−9%

92Kendall County, ILIL145,47032.2−6%

93Effingham County, ILIL34,51931.9−11%

94Lake County, ILIL719,33931.7−6%

95Will County, ILIL712,25331.2−6%

96Kane County, ILIL525,75730.9−4%

97Coles County, ILIL46,60729.9−3%

98McLean County, ILIL171,41929.1−5%

99Champaign County, ILIL209,97227.8−3%

100McDonough County, ILIL25,91627.4−5%

101DeKalb County, ILIL101,83527.3−4%

102Jackson County, ILIL52,50126.5−4%

SHOWING 1–102 OF 102

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