RANKING · 2000 CENSUS · 102 SHOWN OF 102

Oldest by median age, Illinois counties · 2000

Illinois counties ranked by median age of residents (2000 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 1990

01Hardin County, ILIL3,58842.1+13%

02White County, ILIL13,25042.0+10%

03Jo Daviess County, ILIL21,59441.6+15%

04Pope County, ILIL3,67241.1+15%

05Henderson County, ILIL5,98441.0+9%

06Marshall County, ILIL11,47340.9+9%

07Schuyler County, ILIL6,65740.9+8%

08Carroll County, ILIL15,41940.8+9%

09Lawrence County, ILIL13,79040.8+8%

10Gallatin County, ILIL4,61640.7+2%

11Hamilton County, ILIL7,85940.6+3%

12Calhoun County, ILIL4,30040.5+6%

13Edwards County, ILIL5,89840.5+8%

14Franklin County, ILIL36,91640.3+6%

15Hancock County, ILIL16,80340.3+8%

16Union County, ILIL16,65640.3+6%

17Saline County, ILIL22,77239.9+4%

18Stark County, ILIL5,31939.9+5%

19Wayne County, ILIL15,88239.9+7%

20Pike County, ILIL14,23139.8+6%

21Clay County, ILIL12,79339.7+8%

22Bureau County, ILIL32,51039.6+9%

23Iroquois County, ILIL26,15039.6+7%

24Massac County, ILIL13,50239.6+4%

25Piatt County, ILIL16,79139.6+10%

26Putnam County, ILIL5,61939.6+10%

27Mason County, ILIL12,41139.5+8%

28Mercer County, ILIL15,22939.5+9%

29Ford County, ILIL13,21639.4+8%

30Knox County, ILIL47,76739.4+9%

31Edgar County, ILIL16,32339.3+5%

32Shelby County, ILIL20,57639.3+9%

33Clark County, ILIL15,11439.2+6%

34Fulton County, ILIL32,90139.2+6%

35Henry County, ILIL48,09539.1+9%

36Richland County, ILIL15,21939.1+10%

37Wabash County, ILIL10,90739.0+12%

38Christian County, ILIL33,44338.9+7%

39Macoupin County, ILIL43,74838.9+8%

40Scott County, ILIL4,86638.8+8%

41Washington County, ILIL13,56438.8+8%

42Williamson County, ILIL67,22538.8+7%

43Moultrie County, ILIL14,37138.7+5%

44Crawford County, ILIL18,64838.6+4%

45De Witt County, ILIL15,11838.5+9%

46Stephenson County, ILIL43,22038.5+10%

47Whiteside County, ILIL54,12138.5+11%

48Marion County, ILIL36,38238.4+9%

49Adams County, ILIL64,26738.3+7%

50Jasper County, ILIL9,03238.1+10%

51LaSalle County, ILIL107,77338.1+7%

52Montgomery County, ILIL28,07638.1+8%

53Tazewell County, ILIL130,04938.1+10%

54Alexander County, ILIL4,57038.0+9%

55Macon County, ILIL99,30038.0+9%

56Menard County, ILIL11,86338.0+7%

57Vermilion County, ILIL71,25938.0+7%

58Greene County, ILIL11,31337.9+5%

59Lee County, ILIL32,91437.9+10%

60Rock Island County, ILIL141,86937.8+8%

61Morgan County, ILIL32,51537.8+10%

62Warren County, ILIL16,22237.8+8%

63Woodford County, ILIL38,11137.8+11%

64Pulaski County, ILIL4,82037.7+8%

65Jefferson County, ILIL36,14737.6+8%

66Perry County, ILIL20,16037.6+6%

67Randolph County, ILIL29,92137.6+11%

68Monroe County, ILIL34,84037.5+10%

69Fayette County, ILIL20,79037.5+6%

70Douglas County, ILIL19,88037.4+8%

71Sangamon County, ILIL194,17037.3+9%

72Jersey County, ILIL21,16037.3+12%

73Livingston County, ILIL35,05737.3+9%

74Cass County, ILIL12,46337.2+4%

75Cumberland County, ILIL10,20837.2+10%

76Ogle County, ILIL51,39937.2+10%

77Logan County, ILIL27,18237.0+7%

78Madison County, ILIL263,11036.9+9%

79Bond County, ILIL16,95936.8+5%

80Johnson County, ILIL13,36336.7+3%

81Clinton County, ILIL37,12836.6+11%

82Grundy County, ILIL54,05236.3+9%

83Peoria County, ILIL178,55336.0+6%

84Winnebago County, ILIL283,67435.9+7%

85Effingham County, ILIL34,51935.7+12%

86St. Clair County, ILIL250,70835.3+10%

87DuPage County, ILIL934,29835.2+9%

88Brown County, ILIL6,40135.2+5%

89Kankakee County, ILIL105,52535.2+7%

90Boone County, ILIL53,56834.5+4%

91McHenry County, ILIL317,75134.2+6%

92Kendall County, ILIL145,47034.1+6%

93Lake County, ILIL719,33933.8+7%

94Cook County, ILIL5,194,62533.6+3%

95Will County, ILIL712,25333.3+7%

96Kane County, ILIL525,75732.2+4%

97Coles County, ILIL46,60730.8+3%

98McLean County, ILIL171,41930.5+5%

99McDonough County, ILIL25,91629.0+6%

100Champaign County, ILIL209,97228.6+3%

101DeKalb County, ILIL101,83528.4+4%

102Jackson County, ILIL52,50127.5+4%

SHOWING 1–102 OF 102

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS