RANKING · 2025 ESTIMATES · 102 SHOWN OF 102

Fastest shrinking, Illinois counties

Illinois counties with the steepest population decline from the 2020 census to 2025. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Alexander County, ILIL4,570-12.8%−3.0 pts

02Lawrence County, ILIL13,790-9.8%−6.5 pts

03Pulaski County, ILIL4,820-7.2%−4.9 pts

04Gallatin County, ILIL4,616-6.7%+0.0 pts

05Henderson County, ILIL5,984-6.3%−7.8 pts

06Greene County, ILIL11,313-5.6%−2.0 pts

07Edwards County, ILIL5,898-5.6%+0.7 pts

08Mason County, ILIL12,411-5.2%−3.7 pts

09McDonough County, ILIL25,916-4.9%+1.8 pts

10Massac County, ILIL13,502-4.7%−7.5 pts

11Hancock County, ILIL16,803-4.6%+1.2 pts

12White County, ILIL13,250-4.5%+2.4 pts

13Macon County, ILIL99,300-4.5%−2.4 pts

14Cass County, ILIL12,463-4.4%−6.4 pts

15Knox County, ILIL47,767-4.4%−3.4 pts

16Saline County, ILIL22,772-4.2%−4.9 pts

17Wabash County, ILIL10,907-4.0%−2.7 pts

18Vermilion County, ILIL71,259-3.9%+1.0 pts

19Richland County, ILIL15,219-3.8%−1.4 pts

20Perry County, ILIL20,160-3.7%−11.6 pts

21Clay County, ILIL12,793-3.7%−4.4 pts

22Warren County, ILIL16,222-3.6%−1.3 pts

23Lee County, ILIL32,914-3.6%−8.5 pts

24Marion County, ILIL36,382-3.6%−3.9 pts

25Schuyler County, ILIL6,657-3.5%+0.6 pts

26Menard County, ILIL11,863-3.5%−15.4 pts

27Pike County, ILIL14,231-3.4%−2.3 pts

28Iroquois County, ILIL26,150-3.4%−5.2 pts

29Union County, ILIL16,656-3.4%−7.2 pts

30Fayette County, ILIL20,790-3.2%−7.6 pts

31Edgar County, ILIL16,323-3.2%−3.8 pts

32Stephenson County, ILIL43,220-3.2%−5.1 pts

33Calhoun County, ILIL4,300-3.1%+1.4 pts

34Mercer County, ILIL15,229-3.0%−1.1 pts

35Logan County, ILIL27,182-2.9%−4.1 pts

36Whiteside County, ILIL54,121-2.8%−3.6 pts

37Jasper County, ILIL9,032-2.7%+1.9 pts

38Macoupin County, ILIL43,748-2.7%−5.5 pts

39Jefferson County, ILIL36,147-2.6%−10.8 pts

40St. Clair County, ILIL250,708-2.6%−0.0 pts

41De Witt County, ILIL15,118-2.6%−4.3 pts

42Pope County, ILIL3,672-2.4%−3.3 pts

43Henry County, ILIL48,095-2.4%−2.1 pts

44Ford County, ILIL13,216-2.3%−2.1 pts

45Franklin County, ILIL36,916-2.3%+0.9 pts

46Cumberland County, ILIL10,208-2.3%−7.8 pts

47Marshall County, ILIL11,473-2.3%−4.9 pts

48Adams County, ILIL64,267-2.2%−5.5 pts

49Bureau County, ILIL32,510-2.2%−1.7 pts

50Clark County, ILIL15,114-2.2%−9.0 pts

51Livingston County, ILIL35,057-2.1%−3.1 pts

52Fulton County, ILIL32,901-2.1%−2.6 pts

53Jo Daviess County, ILIL21,594-2.0%−4.1 pts

54Shelby County, ILIL20,576-2.0%−4.8 pts

55Rock Island County, ILIL141,869-1.9%−2.4 pts

56Kankakee County, ILIL105,525-1.8%−9.7 pts

57Wayne County, ILIL15,882-1.8%−1.3 pts

58Carroll County, ILIL15,419-1.8%−1.0 pts

59Peoria County, ILIL178,553-1.8%−2.1 pts

60Christian County, ILIL33,443-1.7%−4.5 pts

61LaSalle County, ILIL107,773-1.7%−6.0 pts

62Scott County, ILIL4,866-1.7%+0.2 pts

63Hamilton County, ILIL7,859-1.7%−3.1 pts

64Hardin County, ILIL3,588-1.7%+5.8 pts

65Jersey County, ILIL21,160-1.6%−7.1 pts

66Cook County, ILIL5,194,625-1.5%−6.9 pts

67Stark County, ILIL5,319-1.5%+1.6 pts

68Washington County, ILIL13,564-1.4%−2.7 pts

69Morgan County, ILIL32,515-1.2%−1.8 pts

70Sangamon County, ILIL194,170-1.1%−7.0 pts

71Moultrie County, ILIL14,371-1.1%−3.6 pts

72Madison County, ILIL263,110-1.0%−4.9 pts

73Tazewell County, ILIL130,049-1.0%−4.9 pts

74Woodford County, ILIL38,111-0.9%−9.5 pts

75Jackson County, ILIL52,501-0.9%+1.5 pts

76Randolph County, ILIL29,921-0.8%+1.2 pts

77Ogle County, ILIL51,399-0.8%−11.8 pts

78Montgomery County, ILIL28,076-0.7%−0.5 pts

79Winnebago County, ILIL283,674-0.6%−10.7 pts

80Coles County, ILIL46,607-0.5%−3.6 pts

81Effingham County, ILIL34,519-0.4%−8.5 pts

82Monroe County, ILIL34,840-0.3%−23.5 pts

83Putnam County, ILIL5,619-0.3%−6.5 pts

84Crawford County, ILIL18,648-0.2%−5.2 pts

85Williamson County, ILIL67,225+0.1%−6.1 pts

86DuPage County, ILIL934,298+0.2%−15.5 pts

87Boone County, ILIL53,568+0.2%−35.4 pts

88McLean County, ILIL171,419+0.3%−16.2 pts

89Johnson County, ILIL13,363+0.4%−13.1 pts

90Clinton County, ILIL37,128+0.6%−4.1 pts

91Lake County, ILIL719,339+0.7%−24.1 pts

92Piatt County, ILIL16,791+0.7%−4.5 pts

93Douglas County, ILIL19,880+0.7%−1.6 pts

94Bond County, ILIL16,959+1.4%−16.2 pts

95DeKalb County, ILIL101,835+1.4%−12.8 pts

96Kane County, ILIL525,757+1.8%−25.5 pts

97Champaign County, ILIL209,972+2.0%−1.8 pts

98Will County, ILIL712,253+2.3%−38.3 pts

99McHenry County, ILIL317,751+2.4%−39.5 pts

100Brown County, ILIL6,401+2.5%−16.6 pts

101Grundy County, ILIL54,052+2.9%−13.2 pts

102Kendall County, ILIL145,470+10.3%−28.1 pts

SHOWING 1–102 OF 102

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES