RANKING · 2000 CENSUS · 102 SHOWN OF 102

Most population gained, Illinois counties · 2000

Illinois counties that added the most residents from the 1990 census to 2000, 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 +409.

Flip the list · Most population lost, US counties →

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SAME RANKING BYCities States Metros

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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01Cook County, ILIL5,194,625+271,674–

02Will County, ILIL712,253+144,953–

03Lake County, ILIL719,339+127,938–

04DuPage County, ILIL934,298+122,495–

05Kane County, ILIL525,757+86,648–

06McHenry County, ILIL317,751+76,836–

07Winnebago County, ILIL283,674+25,505–

08McLean County, ILIL171,419+21,253–

09Kendall County, ILIL145,470+15,131–

10DeKalb County, ILIL101,835+11,037–

11Boone County, ILIL53,568+10,980–

12Sangamon County, ILIL194,170+10,565–

13Madison County, ILIL263,110+9,703–

14Kankakee County, ILIL105,525+7,578–

15Champaign County, ILIL209,972+6,644–

16Grundy County, ILIL54,052+5,198–

17Monroe County, ILIL34,840+5,197–

18Ogle County, ILIL51,399+5,075–

19Tazewell County, ILIL130,049+4,793–

20LaSalle County, ILIL107,773+4,596–

21Williamson County, ILIL67,225+3,563–

22Jefferson County, ILIL36,147+3,025–

23Woodford County, ILIL38,111+2,816–

24Bond County, ILIL16,959+2,642–

25Effingham County, ILIL34,519+2,560–

26Adams County, ILIL64,267+2,187–

27Perry County, ILIL20,160+1,682–

28Lee County, ILIL32,914+1,670–

29Clinton County, ILIL37,128+1,591–

30Coles County, ILIL46,607+1,552–

31Johnson County, ILIL13,363+1,531–

32Macoupin County, ILIL43,748+1,340–

33Menard County, ILIL11,863+1,322–

34Jersey County, ILIL21,160+1,129–

35Brown County, ILIL6,401+1,114–

36Clark County, ILIL15,114+1,087–

37Crawford County, ILIL18,648+988–

38Christian County, ILIL33,443+954–

39Stephenson County, ILIL43,220+927–

40Fayette County, ILIL20,790+909–

41Piatt County, ILIL16,791+817–

42Union County, ILIL16,656+674–

43Rock Island County, ILIL141,869+651–

44Shelby County, ILIL20,576+632–

45Peoria County, ILIL178,553+606–

46Cumberland County, ILIL10,208+583–

47Iroquois County, ILIL26,150+547–

48Jo Daviess County, ILIL21,594+468–

49Whiteside County, ILIL54,121+467–

50Douglas County, ILIL19,880+458–

51Massac County, ILIL13,502+409–

52Logan County, ILIL27,182+385–

53Livingston County, ILIL35,057+377–

54Moultrie County, ILIL14,371+357–

55Putnam County, ILIL5,619+356–

56Marshall County, ILIL11,473+334–

57De Witt County, ILIL15,118+282–

58Cass County, ILIL12,463+258–

59Morgan County, ILIL32,515+219–

60Washington County, ILIL13,564+183–

61Saline County, ILIL22,772+182–

62Fulton County, ILIL32,901+170–

63Marion County, ILIL36,382+130–

64Hamilton County, ILIL7,859+122–

65Henderson County, ILIL5,984+117–

66Edgar County, ILIL16,323+109–

67Clay County, ILIL12,793+100–

68Pope County, ILIL3,672+40–

69Ford County, ILIL13,216-34–

70Montgomery County, ILIL28,076-76–

71Wayne County, ILIL15,882-90–

72Scott County, ILIL4,866-107–

73Carroll County, ILIL15,419-131–

74Henry County, ILIL48,095-139–

75Wabash County, ILIL10,907-174–

76Pulaski County, ILIL4,820-175–

77Bureau County, ILIL32,510-185–

78Pike County, ILIL14,231-193–

79Stark County, ILIL5,319-202–

80Mason County, ILIL12,411-231–

81Calhoun County, ILIL4,300-238–

82Schuyler County, ILIL6,657-309–

83Mercer County, ILIL15,229-333–

84Hardin County, ILIL3,588-389–

85Richland County, ILIL15,219-396–

86Warren County, ILIL16,222-446–

87Gallatin County, ILIL4,616-464–

88Edwards County, ILIL5,898-469–

89Jasper County, ILIL9,032-492–

90Lawrence County, ILIL13,790-520–

91Greene County, ILIL11,313-556–

92Knox County, ILIL47,767-557–

93Randolph County, ILIL29,921-690–

94Alexander County, ILIL4,570-1,036–

95White County, ILIL13,250-1,151–

96Hancock County, ILIL16,803-1,252–

97Franklin County, ILIL36,916-1,301–

98Jackson County, ILIL52,501-1,455–

99McDonough County, ILIL25,916-2,331–

100Macon County, ILIL99,300-2,500–

101Vermilion County, ILIL71,259-4,338–

102St. Clair County, ILIL250,708-6,770–

SHOWING 1–102 OF 102

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