RANKING · 2025 ESTIMATES · 102 SHOWN OF 102

Most population lost, Illinois counties

Illinois counties that lost the most residents from the 2020 census to 2025, by raw count of people rather than percentage. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is -414. Biggest climber in the top 100 since 2020: Cook County, IL, up 101 places to #1.

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IllinoisAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01▲101Cook County, ILIL5,194,625-80,916−130%

02▼1St. Clair County, ILIL250,708-6,692−1%

03▲3Macon County, ILIL99,300-4,698+88%

04▲6Peoria County, ILIL178,553-3,277−641%

05▼2Vermilion County, ILIL71,259-2,929−32%

06▲14Rock Island County, ILIL141,869-2,803−531%

07▲7Madison County, ILIL263,110-2,749−128%

08▲11Knox County, ILIL47,767-2,200+295%

09▲38Sangamon County, ILIL194,170-2,173−121%

10▼3Kankakee County, ILIL105,525-1,977−126%

11LaSalle County, ILIL107,773-1,885−141%

12▼10Winnebago County, ILIL283,674-1,676−107%

13▲8Whiteside County, ILIL54,121-1,570−436%

14▲23Lawrence County, ILIL13,790-1,490+187%

15▲27Adams County, ILIL64,267-1,470−167%

16▲1Stephenson County, ILIL43,220-1,410−252%

17▲17Marion County, ILIL36,382-1,347−1136%

18▼10McDonough County, ILIL25,916-1,322−43%

19▼7Tazewell County, ILIL130,049-1,294−127%

20▲7Lee County, ILIL32,914-1,231−174%

21▲1Macoupin County, ILIL43,748-1,219−191%

22▲22Henry County, ILIL48,095-1,189+755%

23▲22Saline County, ILIL22,772-996−647%

24▲7Jefferson County, ILIL36,147-966−132%

25▼2Iroquois County, ILIL26,150-927−269%

26▲3Franklin County, ILIL36,916-888−32%

27▲11Hancock County, ILIL16,803-817−35%

28▼3Logan County, ILIL27,182-805−309%

29▲11Perry County, ILIL20,160-785−147%

30▼14Livingston County, ILIL35,057-758−301%

31▼1Bureau County, ILIL32,510-734+297%

32▼19Fulton County, ILIL32,901-708−516%

33▲32Fayette County, ILIL20,790-698−177%

34▲2Mason County, ILIL12,411-675+192%

35▼9Greene County, ILIL11,313-672+21%

36▼18Alexander County, ILIL4,570-670−35%

37▲6Massac County, ILIL13,502-667−263%

38▲19White County, ILIL13,250-627−46%

39▲16Warren County, ILIL16,222-613+37%

40▲39Richland County, ILIL15,219-594+50%

41▲17Christian County, ILIL33,443-589−162%

42▲32Union County, ILIL16,656-588−187%

43▲26Cass County, ILIL12,463-579−324%

44▼12Edgar County, ILIL16,323-543−598%

45▼10Pike County, ILIL14,231-508+163%

46▲30Clay County, ILIL12,793-495−595%

47▼43Jackson County, ILIL52,501-473−67%

48▲11Mercer County, ILIL15,229-470+41%

49▲23Wabash County, ILIL10,907-454+161%

50▲17Jo Daviess County, ILIL21,594-441−194%

51▲30Menard County, ILIL11,863-434−133%

52▼11Shelby County, ILIL20,576-414−166%

53▼1Henderson County, ILIL5,984-403−444%

54▼30Morgan County, ILIL32,515-400−283%

55▼7De Witt County, ILIL15,118-398−241%

56▼23Ogle County, ILIL51,399-389−108%

57▼7Pulaski County, ILIL4,820-373+113%

58▲28Woodford County, ILIL38,111-356−113%

59▼20Jersey County, ILIL21,160-352−131%

60▲17Edwards County, ILIL5,898-347−26%

61▼7Clark County, ILIL15,114-341−131%

62▲4Gallatin County, ILIL4,616-330−29%

63▲12Ford County, ILIL13,216-318+835%

64▲9Wayne County, ILIL15,882-297+230%

65▲23Carroll County, ILIL15,419-283+116%

66▼13Marshall County, ILIL11,473-269−181%

67▼62Coles County, ILIL46,607-256−116%

68▲12Jasper County, ILIL9,032-255−48%

69▼1Schuyler County, ILIL6,657-245−21%

70Cumberland County, ILIL10,208-242−142%

71▼56Randolph County, ILIL29,921-242−65%

72▼44Montgomery County, ILIL28,076-212+179%

73▼22Washington County, ILIL13,564-197−208%

74▲10Moultrie County, ILIL14,371-155−143%

75▲14Effingham County, ILIL34,519-149−106%

76▼12Calhoun County, ILIL4,300-137−42%

77▲1Hamilton County, ILIL7,859-134−210%

78▲17Monroe County, ILIL34,840-122−102%

79▼18Pope County, ILIL3,672-91−328%

80▲2Scott County, ILIL4,866-83−22%

81▼10Stark County, ILIL5,319-81−60%

82▼19Hardin County, ILIL3,588-61−84%

83▼37Crawford County, ILIL18,648-31−103%

84▼1Putnam County, ILIL5,619-18−105%

85▲5Johnson County, ILIL13,363+55−96%

86▲5Williamson County, ILIL67,225+72−98%

87Piatt County, ILIL16,791+118−86%

88▼28Boone County, ILIL53,568+120−99%

89▼4Douglas County, ILIL19,880+140−69%

90▼28Brown County, ILIL6,401+157−86%

91▼35Clinton County, ILIL37,128+229−86%

92▼43Bond County, ILIL16,959+234−91%

93McLean County, ILIL171,419+465−98%

94▼85DeKalb County, ILIL101,835+1,415−87%

95▲4DuPage County, ILIL934,298+1,421−99%

96Grundy County, ILIL54,052+1,519−71%

97Champaign County, ILIL209,972+4,107−38%

98Lake County, ILIL719,339+4,997−96%

99▼5McHenry County, ILIL317,751+7,522−90%

100▼8Kane County, ILIL525,757+9,235−89%

101▼1Kendall County, ILIL145,470+13,601−10%

102▼1Will County, ILIL712,253+15,898−89%

SHOWING 1–102 OF 102

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES