RANKING · 2020 CENSUS · 102 SHOWN OF 102

Oldest housing stock, Illinois counties · 2020

Illinois counties ranked by oldest median year of construction (2020 ACS). This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 1969.

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SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2010 2020 2024

RANKPLACESTATEPOPMEDIAN YEAR BUILTVS 1990

01Greene County, ILIL11,31319530%

02Warren County, ILIL16,22219540%

03Ford County, ILIL13,21619550%

04Stark County, ILIL5,3191955+1%

05Vermilion County, ILIL71,25919550%

06Bureau County, ILIL32,5101956+1%

07Knox County, ILIL47,76719560%

08Scott County, ILIL4,8661956+1%

09Carroll County, ILIL15,4191957+1%

10Mercer County, ILIL15,22919570%

11Livingston County, ILIL35,05719580%

12Stephenson County, ILIL43,22019580%

13Cook County, ILIL5,194,62519590%

14Edgar County, ILIL16,3231959+1%

15Fulton County, ILIL32,9011959+1%

16Lee County, ILIL32,91419590%

17Lawrence County, ILIL13,79019600%

18Rock Island County, ILIL141,86919600%

19Henry County, ILIL48,09519600%

20Iroquois County, ILIL26,15019600%

21Logan County, ILIL27,18219600%

22White County, ILIL13,25019600%

23LaSalle County, ILIL107,7731961+1%

24Mason County, ILIL12,41119610%

25Pike County, ILIL14,2311961+1%

26Whiteside County, ILIL54,12119610%

27Christian County, ILIL33,4431962+1%

28Hancock County, ILIL16,8031962+1%

29Crawford County, ILIL18,64819630%

30De Witt County, ILIL15,1181963+1%

31Macon County, ILIL99,30019630%

32Marshall County, ILIL11,4731963+1%

33Montgomery County, ILIL28,0761963+1%

34Cass County, ILIL12,4631964+1%

35Fayette County, ILIL20,79019640%

36Peoria County, ILIL178,55319640%

37Adams County, ILIL64,2671965+1%

38Macoupin County, ILIL43,7481965+1%

39Morgan County, ILIL32,51519650%

40Wabash County, ILIL10,90719650%

41Brown County, ILIL6,4011966+1%

42Clark County, ILIL15,1141966+1%

43Edwards County, ILIL5,89819660%

44Franklin County, ILIL36,9161966+1%

45Calhoun County, ILIL4,3001967+1%

46Hardin County, ILIL3,58819670%

47McDonough County, ILIL25,91619670%

48Tazewell County, ILIL130,04919670%

49Alexander County, ILIL4,57019680%

50Pulaski County, ILIL4,82019680%

51Shelby County, ILIL20,5761968+1%

52Saline County, ILIL22,7721969+1%

53Douglas County, ILIL19,8801969+1%

54Madison County, ILIL263,1101969+1%

55Coles County, ILIL46,6071970+1%

56Cumberland County, ILIL10,20819700%

57Hamilton County, ILIL7,8591970+1%

58Moultrie County, ILIL14,3711970+1%

59Ogle County, ILIL51,3991970+1%

60Winnebago County, ILIL283,6741970+1%

61Henderson County, ILIL5,9841971+1%

62Kankakee County, ILIL105,5251971+1%

63Randolph County, ILIL29,9211971+1%

64Richland County, ILIL15,2191971+1%

65Schuyler County, ILIL6,6571971+1%

66Sangamon County, ILIL194,1701972+1%

67Clay County, ILIL12,7931972+1%

68Gallatin County, ILIL4,61619720%

69Marion County, ILIL36,3821972+1%

70Perry County, ILIL20,1601972+1%

71Piatt County, ILIL16,7911972+1%

72Washington County, ILIL13,5641972+1%

73Wayne County, ILIL15,8821972+1%

74St. Clair County, ILIL250,7081974+1%

75Bond County, ILIL16,9591974+1%

76Jasper County, ILIL9,0321974+1%

77Jo Daviess County, ILIL21,5941974+1%

78Menard County, ILIL11,8631974+1%

79Putnam County, ILIL5,6191974+1%

80Union County, ILIL16,6561974+1%

81Woodford County, ILIL38,1111974+1%

82Jefferson County, ILIL36,1471975+1%

83Jersey County, ILIL21,1601975+1%

84Clinton County, ILIL37,1281976+1%

85Jackson County, ILIL52,50119760%

86Massac County, ILIL13,5021976+1%

87DeKalb County, ILIL101,8351977+1%

88Effingham County, ILIL34,51919770%

89DuPage County, ILIL934,29819780%

90Pope County, ILIL3,6721978+1%

91Champaign County, ILIL209,9721979+1%

92McLean County, ILIL171,4191979+1%

93Johnson County, ILIL13,3631980+1%

94Williamson County, ILIL67,2251980+1%

95Lake County, ILIL719,3391981+1%

96Kane County, ILIL525,7571982+1%

97Grundy County, ILIL54,0521984+1%

98Boone County, ILIL53,5681985+1%

99Monroe County, ILIL34,8401989+1%

100McHenry County, ILIL317,7511989+1%

101Will County, ILIL712,2531991+1%

102Kendall County, ILIL145,4702000+2%

SHOWING 1–102 OF 102

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