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%−28.1 pts

02Grundy County, ILIL54,052+2.9%−13.2 pts

03Brown County, ILIL6,401+2.5%−16.6 pts

04McHenry County, ILIL317,751+2.4%−39.5 pts

05Will County, ILIL712,253+2.3%−38.3 pts

06Champaign County, ILIL209,972+2.0%−1.8 pts

07Kane County, ILIL525,757+1.8%−25.5 pts

08DeKalb County, ILIL101,835+1.4%−12.8 pts

09Bond County, ILIL16,959+1.4%−16.2 pts

10Douglas County, ILIL19,880+0.7%−1.6 pts

11Piatt County, ILIL16,791+0.7%−4.5 pts

12Lake County, ILIL719,339+0.7%−24.1 pts

13Clinton County, ILIL37,128+0.6%−4.1 pts

14Johnson County, ILIL13,363+0.4%−13.1 pts

15McLean County, ILIL171,419+0.3%−16.2 pts

16Boone County, ILIL53,568+0.2%−35.4 pts

17DuPage County, ILIL934,298+0.2%−15.5 pts

18Williamson County, ILIL67,225+0.1%−6.1 pts

19Crawford County, ILIL18,648-0.2%−5.2 pts

20Putnam County, ILIL5,619-0.3%−6.5 pts

21Monroe County, ILIL34,840-0.3%−23.5 pts

22Effingham County, ILIL34,519-0.4%−8.5 pts

23Coles County, ILIL46,607-0.5%−3.6 pts

24Winnebago County, ILIL283,674-0.6%−10.7 pts

25Montgomery County, ILIL28,076-0.7%−0.5 pts

26Ogle County, ILIL51,399-0.8%−11.8 pts

27Randolph County, ILIL29,921-0.8%+1.2 pts

28Jackson County, ILIL52,501-0.9%+1.5 pts

29Woodford County, ILIL38,111-0.9%−9.5 pts

30Tazewell County, ILIL130,049-1.0%−4.9 pts

31Madison County, ILIL263,110-1.0%−4.9 pts

32Moultrie County, ILIL14,371-1.1%−3.6 pts

33Sangamon County, ILIL194,170-1.1%−7.0 pts

34Morgan County, ILIL32,515-1.2%−1.8 pts

35Washington County, ILIL13,564-1.4%−2.7 pts

36Stark County, ILIL5,319-1.5%+1.6 pts

37Cook County, ILIL5,194,625-1.5%−6.9 pts

38Jersey County, ILIL21,160-1.6%−7.1 pts

39Hardin County, ILIL3,588-1.7%+5.8 pts

40Hamilton County, ILIL7,859-1.7%−3.1 pts

41Scott County, ILIL4,866-1.7%+0.2 pts

42LaSalle County, ILIL107,773-1.7%−6.0 pts

43Christian County, ILIL33,443-1.7%−4.5 pts

44Peoria County, ILIL178,553-1.8%−2.1 pts

45Carroll County, ILIL15,419-1.8%−1.0 pts

46Wayne County, ILIL15,882-1.8%−1.3 pts

47Kankakee County, ILIL105,525-1.8%−9.7 pts

48Rock Island County, ILIL141,869-1.9%−2.4 pts

49Shelby County, ILIL20,576-2.0%−4.8 pts

50Jo Daviess County, ILIL21,594-2.0%−4.1 pts

51Fulton County, ILIL32,901-2.1%−2.6 pts

52Livingston County, ILIL35,057-2.1%−3.1 pts

53Clark County, ILIL15,114-2.2%−9.0 pts

54Bureau County, ILIL32,510-2.2%−1.7 pts

55Adams County, ILIL64,267-2.2%−5.5 pts

56Marshall County, ILIL11,473-2.3%−4.9 pts

57Cumberland County, ILIL10,208-2.3%−7.8 pts

58Franklin County, ILIL36,916-2.3%+0.9 pts

59Ford County, ILIL13,216-2.3%−2.1 pts

60Henry County, ILIL48,095-2.4%−2.1 pts

61Pope County, ILIL3,672-2.4%−3.3 pts

62De Witt County, ILIL15,118-2.6%−4.3 pts

63St. Clair County, ILIL250,708-2.6%−0.0 pts

64Jefferson County, ILIL36,147-2.6%−10.8 pts

65Macoupin County, ILIL43,748-2.7%−5.5 pts

66Jasper County, ILIL9,032-2.7%+1.9 pts

67Whiteside County, ILIL54,121-2.8%−3.6 pts

68Logan County, ILIL27,182-2.9%−4.1 pts

69Mercer County, ILIL15,229-3.0%−1.1 pts

70Calhoun County, ILIL4,300-3.1%+1.4 pts

71Stephenson County, ILIL43,220-3.2%−5.1 pts

72Edgar County, ILIL16,323-3.2%−3.8 pts

73Fayette County, ILIL20,790-3.2%−7.6 pts

74Union County, ILIL16,656-3.4%−7.2 pts

75Iroquois County, ILIL26,150-3.4%−5.2 pts

76Pike County, ILIL14,231-3.4%−2.3 pts

77Menard County, ILIL11,863-3.5%−15.4 pts

78Schuyler County, ILIL6,657-3.5%+0.6 pts

79Marion County, ILIL36,382-3.6%−3.9 pts

80Lee County, ILIL32,914-3.6%−8.5 pts

81Warren County, ILIL16,222-3.6%−1.3 pts

82Clay County, ILIL12,793-3.7%−4.4 pts

83Perry County, ILIL20,160-3.7%−11.6 pts

84Richland County, ILIL15,219-3.8%−1.4 pts

85Vermilion County, ILIL71,259-3.9%+1.0 pts

86Wabash County, ILIL10,907-4.0%−2.7 pts

87Saline County, ILIL22,772-4.2%−4.9 pts

88Knox County, ILIL47,767-4.4%−3.4 pts

89Cass County, ILIL12,463-4.4%−6.4 pts

90Macon County, ILIL99,300-4.5%−2.4 pts

91White County, ILIL13,250-4.5%+2.4 pts

92Hancock County, ILIL16,803-4.6%+1.2 pts

93Massac County, ILIL13,502-4.7%−7.5 pts

94McDonough County, ILIL25,916-4.9%+1.8 pts

95Mason County, ILIL12,411-5.2%−3.7 pts

96Edwards County, ILIL5,898-5.6%+0.7 pts

97Greene County, ILIL11,313-5.6%−2.0 pts

98Henderson County, ILIL5,984-6.3%−7.8 pts

99Gallatin County, ILIL4,616-6.7%+0.0 pts

100Pulaski County, ILIL4,820-7.2%−4.9 pts

101Lawrence County, ILIL13,790-9.8%−6.5 pts

102Alexander County, ILIL4,570-12.8%−3.0 pts

SHOWING 1–102 OF 102

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES