RANKING · 2020 CENSUS · 102 SHOWN OF 102

Most population lost, Illinois counties · 2020

Illinois counties that lost the most residents from the 2010 census to 2020, by raw count of people rather than percentage. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide.

Flip the list · Most population gained, US counties →

IllinoisAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01St. Clair County, ILIL250,708-12,656+87%

02Winnebago County, ILIL283,674-9,916−139%

03Vermilion County, ILIL71,259-7,437+71%

04Jackson County, ILIL52,501-7,244+398%

05Coles County, ILIL46,607-7,010−552%

06Macon County, ILIL99,300-6,770+171%

07Kankakee County, ILIL105,525-5,947−178%

08McDonough County, ILIL25,916-5,374+131%

09DeKalb County, ILIL101,835-4,740−143%

10Peoria County, ILIL178,553-4,664−870%

11LaSalle County, ILIL107,773-4,266−193%

12Tazewell County, ILIL130,049-4,051−185%

13Fulton County, ILIL32,901-3,460−2135%

14Madison County, ILIL263,110-3,423−135%

15Randolph County, ILIL29,921-3,313+380%

16Livingston County, ILIL35,057-3,135−932%

17Stephenson County, ILIL43,220-3,081−432%

18Alexander County, ILIL4,570-2,998+189%

19Knox County, ILIL47,767-2,952+430%

20Rock Island County, ILIL141,869-2,874−541%

21Whiteside County, ILIL54,121-2,807−701%

22Macoupin County, ILIL43,748-2,798−309%

23Iroquois County, ILIL26,150-2,641−583%

24Morgan County, ILIL32,515-2,632−1302%

25Logan County, ILIL27,182-2,318−702%

26Greene County, ILIL11,313-1,901+242%

27Lee County, ILIL32,914-1,886−213%

28Montgomery County, ILIL28,076-1,816+2289%

29Franklin County, ILIL36,916-1,757+35%

30Bureau County, ILIL32,510-1,734+837%

31Jefferson County, ILIL36,147-1,714−157%

32Edgar County, ILIL16,323-1,710−1669%

33Ogle County, ILIL51,399-1,709−134%

34Marion County, ILIL36,382-1,708−1414%

35Pike County, ILIL14,231-1,691+776%

36Mason County, ILIL12,411-1,580+584%

37Lawrence County, ILIL13,790-1,553+199%

38Hancock County, ILIL16,803-1,484+19%

39Jersey County, ILIL21,160-1,473−230%

40Perry County, ILIL20,160-1,405−184%

41Shelby County, ILIL20,576-1,373−317%

42Adams County, ILIL64,267-1,366−162%

43Massac County, ILIL13,502-1,260−408%

44Henry County, ILIL48,095-1,202+765%

45Saline County, ILIL22,772-1,145−729%

46Crawford County, ILIL18,648-1,138−215%

47Sangamon County, ILIL194,170-1,122−111%

48De Witt County, ILIL15,118-1,045−471%

49Bond County, ILIL16,959-1,043−139%

50Pulaski County, ILIL4,820-968+453%

51Washington County, ILIL13,564-955−622%

52Henderson County, ILIL5,984-944−907%

53Marshall County, ILIL11,473-898−369%

54Clark County, ILIL15,114-880−181%

55Warren County, ILIL16,222-872+96%

56Clinton County, ILIL37,128-863−154%

57White County, ILIL13,250-788−32%

58Christian County, ILIL33,443-768−181%

59Mercer County, ILIL15,229-735+121%

60Boone County, ILIL53,568-717−107%

61Pope County, ILIL3,672-707−1868%

62Brown County, ILIL6,401-693−162%

63Hardin County, ILIL3,588-671+72%

64Calhoun County, ILIL4,300-652+174%

65Fayette County, ILIL20,790-652−172%

66Gallatin County, ILIL4,616-643+39%

67Jo Daviess County, ILIL21,594-643−237%

68Schuyler County, ILIL6,657-642+108%

69Cass County, ILIL12,463-600−333%

70Cumberland County, ILIL10,208-598−203%

71Stark County, ILIL5,319-594+194%

72Wabash County, ILIL10,907-586+237%

73Wayne County, ILIL15,882-581+546%

74Union County, ILIL16,656-564−184%

75Ford County, ILIL13,216-547+1509%

76Clay County, ILIL12,793-527−627%

77Edwards County, ILIL5,898-476+1%

78Hamilton County, ILIL7,859-464−480%

79Richland County, ILIL15,219-420+6%

80Jasper County, ILIL9,032-411−16%

81Menard County, ILIL11,863-408−131%

82Scott County, ILIL4,866-406+279%

83Putnam County, ILIL5,619-369−204%

84Moultrie County, ILIL14,371-320−190%

85Douglas County, ILIL19,880-240−152%

86Woodford County, ILIL38,111-197−107%

87Piatt County, ILIL16,791-56−107%

88Carroll County, ILIL15,419+315−340%

89Effingham County, ILIL34,519+426−83%

90Johnson County, ILIL13,363+726−53%

91Williamson County, ILIL67,225+796−78%

92Kane County, ILIL525,757+1,253−99%

93McLean County, ILIL171,419+1,382−93%

94McHenry County, ILIL317,751+1,469−98%

95Monroe County, ILIL34,840+2,005−61%

96Grundy County, ILIL54,052+2,470−52%

97Champaign County, ILIL209,972+4,784−28%

98Lake County, ILIL719,339+10,880−91%

99DuPage County, ILIL934,298+15,953−87%

100Kendall County, ILIL145,470+17,133+13%

101Will County, ILIL712,253+18,795−87%

102Cook County, ILIL5,194,625+80,866−70%

SHOWING 1–102 OF 102

Download CSV (full list, 102 rows)

UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS