RANKING · 2024 ACS · 102 SHOWN OF 102

Oldest by median age, Illinois counties

Illinois counties ranked by median age of residents (2024 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

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Pope County, ILIL3,67253.9+31%

02Hardin County, ILIL3,58853.6+27%

03Jo Daviess County, ILIL21,59451.5+24%

04Henderson County, ILIL5,98450.2+22%

05Schuyler County, ILIL6,65749.1+20%

06Calhoun County, ILIL4,30048.8+20%

07Alexander County, ILIL4,57048.0+26%

08Putnam County, ILIL5,61947.4+20%

09Hancock County, ILIL16,80346.9+16%

10Gallatin County, ILIL4,61646.7+15%

11Edgar County, ILIL16,32346.6+19%

12Marshall County, ILIL11,47346.1+13%

13Scott County, ILIL4,86646.0+19%

14Carroll County, ILIL15,41945.4+11%

15Mason County, ILIL12,41145.4+15%

16Shelby County, ILIL20,57645.3+15%

17Stephenson County, ILIL43,22045.3+18%

18Edwards County, ILIL5,89844.7+10%

19Massac County, ILIL13,50244.7+13%

20Mercer County, ILIL15,22944.7+13%

21Iroquois County, ILIL26,15044.4+12%

22Stark County, ILIL5,31944.4+11%

23Jasper County, ILIL9,03244.3+16%

24Union County, ILIL16,65644.3+10%

25White County, ILIL13,25044.3+5%

26Macoupin County, ILIL43,74844.2+14%

27Washington County, ILIL13,56444.2+14%

28Bureau County, ILIL32,51044.1+11%

29Fulton County, ILIL32,90143.9+12%

30Hamilton County, ILIL7,85943.9+8%

31Saline County, ILIL22,77243.8+10%

32De Witt County, ILIL15,11843.7+14%

33Jersey County, ILIL21,16043.7+17%

34Randolph County, ILIL29,92143.7+16%

35Henry County, ILIL48,09543.6+12%

36Franklin County, ILIL36,91643.4+8%

37Greene County, ILIL11,31343.4+15%

38Monroe County, ILIL34,84043.2+15%

39Christian County, ILIL33,44343.2+11%

40Wabash County, ILIL10,90743.2+11%

41Cumberland County, ILIL10,20843.1+16%

42Lee County, ILIL32,91443.1+14%

43Pike County, ILIL14,23143.0+8%

44Pulaski County, ILIL4,82043.0+14%

45Whiteside County, ILIL54,12143.0+12%

46Menard County, ILIL11,86342.8+13%

47Montgomery County, ILIL28,07642.8+12%

48Piatt County, ILIL16,79142.8+8%

49Wayne County, ILIL15,88242.8+7%

50Crawford County, ILIL18,64842.6+10%

51Clark County, ILIL15,11442.6+9%

52Knox County, ILIL47,76742.6+8%

53Richland County, ILIL15,21942.3+8%

54LaSalle County, ILIL107,77342.2+11%

55Ogle County, ILIL51,39942.2+13%

56Perry County, ILIL20,16042.0+12%

57Fayette County, ILIL20,79041.9+12%

58Ford County, ILIL13,21641.9+6%

59Tazewell County, ILIL130,04941.9+10%

60Livingston County, ILIL35,05741.8+12%

61Williamson County, ILIL67,22541.6+7%

62Clinton County, ILIL37,12841.5+13%

63Marion County, ILIL36,38241.5+8%

64Adams County, ILIL64,26741.4+8%

65Johnson County, ILIL13,36341.4+13%

66Vermilion County, ILIL71,25941.3+9%

67Jefferson County, ILIL36,14741.2+10%

68Logan County, ILIL27,18241.1+11%

69Morgan County, ILIL32,51541.1+9%

70Sangamon County, ILIL194,17041.0+10%

71Brown County, ILIL6,40141.0+16%

72Lawrence County, ILIL13,79040.7−0%

73McHenry County, ILIL317,75140.7+19%

74Macon County, ILIL99,30040.6+7%

75Clay County, ILIL12,79340.4+2%

76Woodford County, ILIL38,11140.4+7%

77Rock Island County, ILIL141,86940.3+7%

78DuPage County, ILIL934,29840.2+14%

79Madison County, ILIL263,11040.2+9%

80Moultrie County, ILIL14,37140.1+4%

81Effingham County, ILIL34,51940.0+12%

82St. Clair County, ILIL250,70839.9+13%

83Bond County, ILIL16,95939.7+8%

84Boone County, ILIL53,56839.7+15%

85Winnebago County, ILIL283,67439.6+10%

86Lake County, ILIL719,33939.1+16%

87Will County, ILIL712,25339.1+17%

88Kankakee County, ILIL105,52539.0+11%

89Kane County, ILIL525,75738.8+20%

90Douglas County, ILIL19,88038.7+3%

91Warren County, ILIL16,22238.5+2%

92Cass County, ILIL12,46338.3+3%

93Grundy County, ILIL54,05238.3+6%

94Peoria County, ILIL178,55338.1+6%

95Cook County, ILIL5,194,62538.0+13%

96Coles County, ILIL46,60737.5+22%

97Kendall County, ILIL145,47036.3+6%

98McDonough County, ILIL25,91634.9+20%

99McLean County, ILIL171,41934.3+12%

100DeKalb County, ILIL101,83532.7+15%

101Jackson County, ILIL52,50132.4+18%

102Champaign County, ILIL209,97230.7+7%

SHOWING 1–102 OF 102

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES