RANKING · 2020 CENSUS · 102 SHOWN OF 102

Oldest by median age, Illinois counties · 2020

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

01Pope County, ILIL3,67252.5+28%

02Hardin County, ILIL3,58852.2+24%

03Henderson County, ILIL5,98450.1+22%

04Jo Daviess County, ILIL21,59450.1+20%

05Alexander County, ILIL4,57049.1+29%

06Calhoun County, ILIL4,30049.0+21%

07Schuyler County, ILIL6,65747.5+16%

08Gallatin County, ILIL4,61647.3+16%

09Putnam County, ILIL5,61947.0+19%

10Carroll County, ILIL15,41946.5+14%

11Marshall County, ILIL11,47346.2+13%

12Hancock County, ILIL16,80346.1+14%

13Mason County, ILIL12,41146.1+17%

14Pulaski County, ILIL4,82046.0+22%

15Stephenson County, ILIL43,22045.9+19%

16Edgar County, ILIL16,32345.5+16%

17Stark County, ILIL5,31945.5+14%

18Shelby County, ILIL20,57645.4+16%

19Mercer County, ILIL15,22945.1+14%

20White County, ILIL13,25045.1+7%

21Union County, ILIL16,65644.9+11%

22Bureau County, ILIL32,51044.8+13%

23Iroquois County, ILIL26,15044.5+12%

24Macoupin County, ILIL43,74844.4+14%

25Scott County, ILIL4,86644.4+14%

26Washington County, ILIL13,56444.4+14%

27Whiteside County, ILIL54,12144.4+15%

28Greene County, ILIL11,31344.3+17%

29Massac County, ILIL13,50244.3+12%

30Fulton County, ILIL32,90144.2+13%

31Jersey County, ILIL21,16044.2+18%

32Franklin County, ILIL36,91644.1+9%

33Jasper County, ILIL9,03244.1+16%

34Lee County, ILIL32,91443.7+15%

35Montgomery County, ILIL28,07643.7+15%

36Piatt County, ILIL16,79143.7+10%

37De Witt County, ILIL15,11843.6+13%

38Edwards County, ILIL5,89843.6+8%

39Menard County, ILIL11,86343.6+15%

40Christian County, ILIL33,44343.5+12%

41Clark County, ILIL15,11443.4+11%

42Knox County, ILIL47,76743.3+10%

43Saline County, ILIL22,77243.2+8%

44Hamilton County, ILIL7,85943.2+6%

45Henry County, ILIL48,09543.2+10%

46Richland County, ILIL15,21943.2+10%

47Crawford County, ILIL18,64843.1+12%

48Randolph County, ILIL29,92143.1+15%

49Wabash County, ILIL10,90743.1+11%

50Pike County, ILIL14,23143.0+8%

51Clay County, ILIL12,79342.9+8%

52Ford County, ILIL13,21642.9+9%

53Monroe County, ILIL34,84042.8+14%

54Cumberland County, ILIL10,20842.8+15%

55Johnson County, ILIL13,36342.8+17%

56Wayne County, ILIL15,88242.8+7%

57Marion County, ILIL36,38242.7+11%

58LaSalle County, ILIL107,77342.5+12%

59Morgan County, ILIL32,51542.5+12%

60Livingston County, ILIL35,05742.4+14%

61Jefferson County, ILIL36,14742.2+12%

62Perry County, ILIL20,16042.0+12%

63Logan County, ILIL27,18241.9+13%

64Ogle County, ILIL51,39941.9+13%

65Tazewell County, ILIL130,04941.9+10%

66Williamson County, ILIL67,22541.9+8%

67Bond County, ILIL16,95941.7+13%

68Vermilion County, ILIL71,25941.7+10%

69Lawrence County, ILIL13,79041.4+1%

70Fayette County, ILIL20,79041.4+10%

71Clinton County, ILIL37,12841.3+13%

72Adams County, ILIL64,26741.3+8%

73Macon County, ILIL99,30041.3+9%

74Sangamon County, ILIL194,17041.1+10%

75Moultrie County, ILIL14,37141.1+6%

76Woodford County, ILIL38,11141.1+9%

77Warren County, ILIL16,22240.9+8%

78McHenry County, ILIL317,75140.8+19%

79Rock Island County, ILIL141,86940.6+7%

80Effingham County, ILIL34,51940.5+13%

81Madison County, ILIL263,11040.3+9%

82DuPage County, ILIL934,29840.1+14%

83Brown County, ILIL6,40140.1+14%

84Winnebago County, ILIL283,67440.0+11%

85Boone County, ILIL53,56839.9+16%

86Douglas County, ILIL19,88039.6+6%

87Kankakee County, ILIL105,52539.6+12%

88St. Clair County, ILIL250,70839.3+11%

89Lake County, ILIL719,33939.3+16%

90Cass County, ILIL12,46339.0+5%

91Will County, ILIL712,25339.0+17%

92Coles County, ILIL46,60738.8+26%

93Grundy County, ILIL54,05238.7+7%

94Peoria County, ILIL178,55338.5+7%

95Kane County, ILIL525,75738.3+19%

96Cook County, ILIL5,194,62537.4+11%

97McDonough County, ILIL25,91637.0+28%

98Kendall County, ILIL145,47035.8+5%

99McLean County, ILIL171,41935.1+15%

100Jackson County, ILIL52,50134.9+27%

101DeKalb County, ILIL101,83534.3+21%

102Champaign County, ILIL209,97230.8+8%

SHOWING 1–102 OF 102

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