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.

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SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

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

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

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

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

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

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

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

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

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

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

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

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

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

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

15Adams County, ILIL64,267-1,470−167%

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

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

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

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

20Lee County, ILIL32,914-1,231−174%

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

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

23Saline County, ILIL22,772-996−647%

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

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

26Franklin County, ILIL36,916-888−32%

27Hancock County, ILIL16,803-817−35%

28Logan County, ILIL27,182-805−309%

29Perry County, ILIL20,160-785−147%

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

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

32Fulton County, ILIL32,901-708−516%

33Fayette County, ILIL20,790-698−177%

34Mason County, ILIL12,411-675+192%

35Greene County, ILIL11,313-672+21%

36Alexander County, ILIL4,570-670−35%

37Massac County, ILIL13,502-667−263%

38White County, ILIL13,250-627−46%

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

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

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

42Union County, ILIL16,656-588−187%

43Cass County, ILIL12,463-579−324%

44Edgar County, ILIL16,323-543−598%

45Pike County, ILIL14,231-508+163%

46Clay County, ILIL12,793-495−595%

47Jackson County, ILIL52,501-473−67%

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

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

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

51Menard County, ILIL11,863-434−133%

52Shelby County, ILIL20,576-414−166%

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

54Morgan County, ILIL32,515-400−283%

55De Witt County, ILIL15,118-398−241%

56Ogle County, ILIL51,399-389−108%

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

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

59Jersey County, ILIL21,160-352−131%

60Edwards County, ILIL5,898-347−26%

61Clark County, ILIL15,114-341−131%

62Gallatin County, ILIL4,616-330−29%

63Ford County, ILIL13,216-318+835%

64Wayne County, ILIL15,882-297+230%

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

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

67Coles County, ILIL46,607-256−116%

68Jasper County, ILIL9,032-255−48%

69Schuyler County, ILIL6,657-245−21%

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

71Randolph County, ILIL29,921-242−65%

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

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

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

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

76Calhoun County, ILIL4,300-137−42%

77Hamilton County, ILIL7,859-134−210%

78Monroe County, ILIL34,840-122−102%

79Pope County, ILIL3,672-91−328%

80Scott County, ILIL4,866-83−22%

81Stark County, ILIL5,319-81−60%

82Hardin County, ILIL3,588-61−84%

83Crawford County, ILIL18,648-31−103%

84Putnam County, ILIL5,619-18−105%

85Johnson County, ILIL13,363+55−96%

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

87Piatt County, ILIL16,791+118−86%

88Boone County, ILIL53,568+120−99%

89Douglas County, ILIL19,880+140−69%

90Brown County, ILIL6,401+157−86%

91Clinton County, ILIL37,128+229−86%

92Bond County, ILIL16,959+234−91%

93McLean County, ILIL171,419+465−98%

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

95DuPage 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%

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

100Kane County, ILIL525,757+9,235−89%

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

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

SHOWING 1–102 OF 102

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES