RANKING · 2020 CENSUS · 102 SHOWN OF 102

Oldest by median age, Illinois counties · 2020

Illinois counties ranked by median age of residents (2020 ACS). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 42.9.

Flip the list · Youngest by median age, US counties →

IllinoisAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

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

Download CSV (full list, 102 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS