RANKING · 2000 CENSUS · 102 SHOWN OF 102

Youngest by median age, Illinois counties · 2000

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, ILIL52,50127.5+0%

02DeKalb County, ILIL101,83528.4+0%

03Champaign County, ILIL209,97228.6+0%

04McDonough County, ILIL25,91629.0+0%

05McLean County, ILIL171,41930.5+0%

06Coles County, ILIL46,60730.8+0%

07Kane County, ILIL525,75732.2+0%

08Will County, ILIL712,25333.3+0%

09Cook County, ILIL5,194,62533.6+0%

10Lake County, ILIL719,33933.8+0%

11Kendall County, ILIL145,47034.1+0%

12McHenry County, ILIL317,75134.2+0%

13Boone County, ILIL53,56834.5+0%

14DuPage County, ILIL934,29835.2+0%

15Brown County, ILIL6,40135.2+0%

16Kankakee County, ILIL105,52535.2+0%

17St. Clair County, ILIL250,70835.3+0%

18Effingham County, ILIL34,51935.7+0%

19Winnebago County, ILIL283,67435.9+0%

20Peoria County, ILIL178,55336.0+0%

21Grundy County, ILIL54,05236.3+0%

22Clinton County, ILIL37,12836.6+0%

23Johnson County, ILIL13,36336.7+0%

24Bond County, ILIL16,95936.8+0%

25Madison County, ILIL263,11036.9+0%

26Logan County, ILIL27,18237.0+0%

27Cass County, ILIL12,46337.2+0%

28Cumberland County, ILIL10,20837.2+0%

29Ogle County, ILIL51,39937.2+0%

30Sangamon County, ILIL194,17037.3+0%

31Jersey County, ILIL21,16037.3+0%

32Livingston County, ILIL35,05737.3+0%

33Douglas County, ILIL19,88037.4+0%

34Monroe County, ILIL34,84037.5+0%

35Fayette County, ILIL20,79037.5+0%

36Jefferson County, ILIL36,14737.6+0%

37Perry County, ILIL20,16037.6+0%

38Randolph County, ILIL29,92137.6+0%

39Pulaski County, ILIL4,82037.7+0%

40Rock Island County, ILIL141,86937.8+0%

41Morgan County, ILIL32,51537.8+0%

42Warren County, ILIL16,22237.8+0%

43Woodford County, ILIL38,11137.8+0%

44Greene County, ILIL11,31337.9+0%

45Lee County, ILIL32,91437.9+0%

46Alexander County, ILIL4,57038.0+0%

47Macon County, ILIL99,30038.0+0%

48Menard County, ILIL11,86338.0+0%

49Vermilion County, ILIL71,25938.0+0%

50Jasper County, ILIL9,03238.1+0%

51LaSalle County, ILIL107,77338.1+0%

52Montgomery County, ILIL28,07638.1+0%

53Tazewell County, ILIL130,04938.1+0%

54Adams County, ILIL64,26738.3+0%

55Marion County, ILIL36,38238.4+0%

56De Witt County, ILIL15,11838.5+0%

57Stephenson County, ILIL43,22038.5+0%

58Whiteside County, ILIL54,12138.5+0%

59Crawford County, ILIL18,64838.6+0%

60Moultrie County, ILIL14,37138.7+0%

61Scott County, ILIL4,86638.8+0%

62Washington County, ILIL13,56438.8+0%

63Williamson County, ILIL67,22538.8+0%

64Christian County, ILIL33,44338.9+0%

65Macoupin County, ILIL43,74838.9+0%

66Wabash County, ILIL10,90739.0+0%

67Henry County, ILIL48,09539.1+0%

68Richland County, ILIL15,21939.1+0%

69Clark County, ILIL15,11439.2+0%

70Fulton County, ILIL32,90139.2+0%

71Edgar County, ILIL16,32339.3+0%

72Shelby County, ILIL20,57639.3+0%

73Ford County, ILIL13,21639.4+0%

74Knox County, ILIL47,76739.4+0%

75Mason County, ILIL12,41139.5+0%

76Mercer County, ILIL15,22939.5+0%

77Bureau County, ILIL32,51039.6+0%

78Iroquois County, ILIL26,15039.6+0%

79Massac County, ILIL13,50239.6+0%

80Piatt County, ILIL16,79139.6+0%

81Putnam County, ILIL5,61939.6+0%

82Clay County, ILIL12,79339.7+0%

83Pike County, ILIL14,23139.8+0%

84Saline County, ILIL22,77239.9+0%

85Stark County, ILIL5,31939.9+0%

86Wayne County, ILIL15,88239.9+0%

87Franklin County, ILIL36,91640.3+0%

88Hancock County, ILIL16,80340.3+0%

89Union County, ILIL16,65640.3+0%

90Calhoun County, ILIL4,30040.5+0%

91Edwards County, ILIL5,89840.5+0%

92Hamilton County, ILIL7,85940.6+0%

93Gallatin County, ILIL4,61640.7+0%

94Carroll County, ILIL15,41940.8+0%

95Lawrence County, ILIL13,79040.8+0%

96Marshall County, ILIL11,47340.9+0%

97Schuyler County, ILIL6,65740.9+0%

98Henderson County, ILIL5,98441.0+0%

99Pope County, ILIL3,67241.1+0%

100Jo Daviess County, ILIL21,59441.6+0%

101White County, ILIL13,25042.0+0%

102Hardin County, ILIL3,58842.1+0%

SHOWING 1–102 OF 102

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