RANKING · 2024 ACS · 102 SHOWN OF 102

Youngest by median age, Illinois counties

Illinois counties with the youngest median age (2024 ACS). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 42.6. Biggest climber in the top 100 since 2020: Pulaski County, IL, up 30 places to #59.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Champaign County, ILIL209,97230.7+7%

02▲1Jackson County, ILIL52,50132.4+18%

03▼1DeKalb County, ILIL101,83532.7+15%

04McLean County, ILIL171,41934.3+12%

05▲1McDonough County, ILIL25,91634.9+20%

06▼1Kendall County, ILIL145,47036.3+6%

07▲4Coles County, ILIL46,60737.5+22%

08▼1Cook County, ILIL5,194,62538.0+13%

09Peoria County, ILIL178,55338.1+6%

10▲2Cass County, ILIL12,46338.3+3%

11▼1Grundy County, ILIL54,05238.3+6%

12▲14Warren County, ILIL16,22238.5+2%

13▲3Douglas County, ILIL19,88038.7+3%

14▼6Kane County, ILIL525,75738.8+20%

15▲2Kankakee County, ILIL105,52539.0+11%

16▼1Lake County, ILIL719,33939.1+16%

17▼4Will County, ILIL712,25339.1+17%

18▲1Winnebago County, ILIL283,67439.6+10%

19▲16Bond County, ILIL16,95939.7+8%

20▼2Boone County, ILIL53,56839.7+15%

21▼7St. Clair County, ILIL250,70839.9+13%

22▲1Effingham County, ILIL34,51940.0+12%

23▲5Moultrie County, ILIL14,37140.1+4%

24▼4DuPage County, ILIL934,29840.2+14%

25▼3Madison County, ILIL263,11040.2+9%

26▼2Rock Island County, ILIL141,86940.3+7%

27▲24Clay County, ILIL12,79340.4+2%

28▲1Woodford County, ILIL38,11140.4+7%

29▲3Macon County, ILIL99,30040.6+7%

30▲3Lawrence County, ILIL13,79040.70%

31▼6McHenry County, ILIL317,75140.7+19%

32▼5Sangamon County, ILIL194,17041.0+10%

33▼12Brown County, ILIL6,40141.0+16%

34▲3Logan County, ILIL27,18241.1+11%

35▲10Morgan County, ILIL32,51541.1+9%

36▲6Jefferson County, ILIL36,14741.2+10%

37▼1Vermilion County, ILIL71,25941.3+9%

38▼7Adams County, ILIL64,26741.4+8%

39▲10Johnson County, ILIL13,36341.4+13%

40▼10Clinton County, ILIL37,12841.5+13%

41▲5Marion County, ILIL36,38241.5+8%

42▼2Williamson County, ILIL67,22541.6+7%

43Livingston County, ILIL35,05741.8+12%

44▼10Fayette County, ILIL20,79041.9+12%

45▲7Ford County, ILIL13,21641.9+6%

46▼7Tazewell County, ILIL130,04941.9+10%

47▼6Perry County, ILIL20,16042.0+12%

48▼4LaSalle County, ILIL107,77342.2+11%

49▼11Ogle County, ILIL51,39942.2+13%

50▲10Richland County, ILIL15,21942.3+8%

51▲3Crawford County, ILIL18,64842.6+10%

52▲10Clark County, ILIL15,11442.6+9%

53▲8Knox County, ILIL47,76742.6+8%

54▲12Menard County, ILIL11,86342.8+13%

55▲13Montgomery County, ILIL28,07642.8+12%

56▲13Piatt County, ILIL16,79142.8+8%

57▼7Wayne County, ILIL15,88242.8+7%

58▼5Pike County, ILIL14,23143.0+8%

59▲30Pulaski County, ILIL4,82043.0+14%

60▲19Whiteside County, ILIL54,12143.0+12%

61▼13Cumberland County, ILIL10,20843.1+16%

62▲5Lee County, ILIL32,91443.1+14%

63▼16Monroe County, ILIL34,84043.2+15%

64▼1Christian County, ILIL33,44343.2+11%

65▼9Wabash County, ILIL10,90743.2+11%

66▲4Franklin County, ILIL36,91643.4+8%

67▲7Greene County, ILIL11,31343.4+15%

68▼9Henry County, ILIL48,09543.6+12%

69▼5De Witt County, ILIL15,11843.7+14%

70▲3Jersey County, ILIL21,16043.7+17%

71▼16Randolph County, ILIL29,92143.7+16%

72▼15Saline County, ILIL22,77243.8+10%

73▼1Fulton County, ILIL32,90143.9+12%

74▼16Hamilton County, ILIL7,85943.9+8%

75▲6Bureau County, ILIL32,51044.1+11%

76Macoupin County, ILIL43,74844.2+14%

77▲1Washington County, ILIL13,56444.2+14%

78▼7Jasper County, ILIL9,03244.3+16%

79▲3Union County, ILIL16,65644.3+10%

80▲4White County, ILIL13,25044.3+5%

81▼1Iroquois County, ILIL26,15044.4+12%

82▲5Stark County, ILIL5,31944.4+11%

83▼18Edwards County, ILIL5,89844.7+10%

84▼9Massac County, ILIL13,50244.7+13%

85▼2Mercer County, ILIL15,22944.7+13%

86▼1Shelby County, ILIL20,57645.3+15%

87▲1Stephenson County, ILIL43,22045.3+18%

88▲5Carroll County, ILIL15,41945.4+11%

89▲2Mason County, ILIL12,41145.4+15%

90▼13Scott County, ILIL4,86646.0+19%

91▲1Marshall County, ILIL11,47346.1+13%

92▼6Edgar County, ILIL16,32346.6+19%

93▲2Gallatin County, ILIL4,61646.7+15%

94▼4Hancock County, ILIL16,80346.9+16%

95▼1Putnam County, ILIL5,61947.4+20%

96▲2Alexander County, ILIL4,57048.0+26%

97Calhoun County, ILIL4,30048.8+20%

98▼2Schuyler County, ILIL6,65749.1+20%

99Henderson County, ILIL5,98450.2+22%

100Jo Daviess County, ILIL21,59451.5+24%

101Hardin County, ILIL3,58853.6+27%

102Pope County, ILIL3,67253.9+31%

SHOWING 1–102 OF 102

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES