RANKING · 2025 ESTIMATES · 102 SHOWN OF 102

Fastest growing, Illinois counties

Illinois counties ranked by population growth 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Kendall County, ILIL145,470+10.3%−73%

02Grundy County, ILIL54,052+2.9%−82%

03Brown County, ILIL6,401+2.5%−87%

04McHenry County, ILIL317,751+2.4%−94%

05Will County, ILIL712,253+2.3%−94%

06Champaign County, ILIL209,972+2.0%−48%

07Kane County, ILIL525,757+1.8%−93%

08DeKalb County, ILIL101,835+1.4%−90%

09Bond County, ILIL16,959+1.4%−92%

10Douglas County, ILIL19,880+0.7%−70%

11Piatt County, ILIL16,791+0.7%−87%

12Lake County, ILIL719,339+0.7%−97%

13Clinton County, ILIL37,128+0.6%−87%

14Johnson County, ILIL13,363+0.4%−97%

15McLean County, ILIL171,419+0.3%−98%

16Boone County, ILIL53,568+0.2%−99%

17DuPage County, ILIL934,298+0.2%−99%

18Williamson County, ILIL67,225+0.1%−98%

19Crawford County, ILIL18,648-0.2%−103%

20Putnam County, ILIL5,619-0.3%−105%

21Monroe County, ILIL34,840-0.3%−102%

22Effingham County, ILIL34,519-0.4%−105%

23Coles County, ILIL46,607-0.5%−118%

24Winnebago County, ILIL283,674-0.6%−106%

25Montgomery County, ILIL28,076-0.7%+203%

26Ogle County, ILIL51,399-0.8%−107%

27Randolph County, ILIL29,921-0.8%−60%

28Jackson County, ILIL52,501-0.9%−63%

29Woodford County, ILIL38,111-0.9%−111%

30Tazewell County, ILIL130,049-1.0%−125%

31Madison County, ILIL263,110-1.0%−127%

32Moultrie County, ILIL14,371-1.1%−142%

33Sangamon County, ILIL194,170-1.1%−119%

34Morgan County, ILIL32,515-1.2%−302%

35Washington County, ILIL13,564-1.4%−217%

36Stark County, ILIL5,319-1.5%−51%

37Cook County, ILIL5,194,625-1.5%−129%

38Jersey County, ILIL21,160-1.6%−130%

39Hardin County, ILIL3,588-1.7%−78%

40Hamilton County, ILIL7,859-1.7%−217%

41Scott County, ILIL4,866-1.7%−12%

42LaSalle County, ILIL107,773-1.7%−140%

43Christian County, ILIL33,443-1.7%−162%

44Peoria County, ILIL178,553-1.8%−644%

45Carroll County, ILIL15,419-1.8%+131%

46Wayne County, ILIL15,882-1.8%+252%

47Kankakee County, ILIL105,525-1.8%−123%

48Rock Island County, ILIL141,869-1.9%−543%

49Shelby County, ILIL20,576-2.0%−169%

50Jo Daviess County, ILIL21,594-2.0%−193%

51Fulton County, ILIL32,901-2.1%−572%

52Livingston County, ILIL35,057-2.1%−321%

53Clark County, ILIL15,114-2.2%−132%

54Bureau County, ILIL32,510-2.2%+326%

55Adams County, ILIL64,267-2.2%−168%

56Marshall County, ILIL11,473-2.3%−188%

57Cumberland County, ILIL10,208-2.3%−142%

58Franklin County, ILIL36,916-2.3%−27%

59Ford County, ILIL13,216-2.3%+887%

60Henry County, ILIL48,095-2.4%+788%

61Pope County, ILIL3,672-2.4%−364%

62De Witt County, ILIL15,118-2.6%−250%

63St. Clair County, ILIL250,708-2.6%+1%

64Jefferson County, ILIL36,147-2.6%−132%

65Macoupin County, ILIL43,748-2.7%−196%

66Jasper County, ILIL9,032-2.7%−41%

67Whiteside County, ILIL54,121-2.8%−463%

68Logan County, ILIL27,182-2.9%−330%

69Mercer County, ILIL15,229-3.0%+55%

70Calhoun County, ILIL4,300-3.1%−31%

71Stephenson County, ILIL43,220-3.2%−264%

72Edgar County, ILIL16,323-3.2%−679%

73Fayette County, ILIL20,790-3.2%−175%

74Union County, ILIL16,656-3.4%−189%

75Iroquois County, ILIL26,150-3.4%−293%

76Pike County, ILIL14,231-3.4%+214%

77Menard County, ILIL11,863-3.5%−130%

78Schuyler County, ILIL6,657-3.5%−14%

79Marion County, ILIL36,382-3.6%−1241%

80Lee County, ILIL32,914-3.6%−174%

81Warren County, ILIL16,222-3.6%+57%

82Clay County, ILIL12,793-3.7%−639%

83Perry County, ILIL20,160-3.7%−148%

84Richland County, ILIL15,219-3.8%+57%

85Vermilion County, ILIL71,259-3.9%−20%

86Wabash County, ILIL10,907-4.0%+201%

87Saline County, ILIL22,772-4.2%−711%

88Knox County, ILIL47,767-4.4%+346%

89Cass County, ILIL12,463-4.4%−331%

90Macon County, ILIL99,300-4.5%+112%

91White County, ILIL13,250-4.5%−35%

92Hancock County, ILIL16,803-4.6%−21%

93Massac County, ILIL13,502-4.7%−270%

94McDonough County, ILIL25,916-4.9%−27%

95Mason County, ILIL12,411-5.2%+263%

96Edwards County, ILIL5,898-5.6%−12%

97Greene County, ILIL11,313-5.6%+54%

98Henderson County, ILIL5,984-6.3%−537%

99Gallatin County, ILIL4,616-6.7%−1%

100Pulaski County, ILIL4,820-7.2%+209%

101Lawrence County, ILIL13,790-9.8%+200%

102Alexander County, ILIL4,570-12.8%+31%

SHOWING 1–102 OF 102

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