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. The median across all 102 is -2.1%. Biggest climber in the top 100 since 2020: Brown County, IL, up 86 places to #3.

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IllinoisAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Kendall County, ILIL145,470+10.3%−28.1 pts

02▲2Grundy County, ILIL54,052+2.9%−13.2 pts

03▲86Brown County, ILIL6,401+2.5%−16.6 pts

04▲10McHenry 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

07▲8Kane County, ILIL525,757+1.8%−25.5 pts

08▲39DeKalb County, ILIL101,835+1.4%−12.8 pts

09▲54Bond County, ILIL16,959+1.4%−16.2 pts

10▲9Douglas County, ILIL19,880+0.7%−1.6 pts

11▲5Piatt County, ILIL16,791+0.7%−4.5 pts

12▼2Lake County, ILIL719,339+0.7%−24.1 pts

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

14▼11Johnson County, ILIL13,363+0.4%−13.1 pts

15▼2McLean County, ILIL171,419+0.3%−16.2 pts

16▲5Boone County, ILIL53,568+0.2%−35.4 pts

17▼9DuPage County, ILIL934,298+0.2%−15.5 pts

18▼6Williamson County, ILIL67,225+0.1%−6.1 pts

19▲42Crawford County, ILIL18,648-0.2%−5.2 pts

20▲47Putnam County, ILIL5,619-0.3%−6.5 pts

21▼19Monroe County, ILIL34,840-0.3%−23.5 pts

22▼11Effingham County, ILIL34,519-0.4%−8.5 pts

23▲73Coles County, ILIL46,607-0.5%−3.6 pts

24▲12Winnebago County, ILIL283,674-0.6%−10.7 pts

25▲39Montgomery County, ILIL28,076-0.7%−0.5 pts

26▲8Ogle County, ILIL51,399-0.8%−11.8 pts

27▲60Randolph County, ILIL29,921-0.8%+1.2 pts

28▲65Jackson County, ILIL52,501-0.9%+1.5 pts

29▼12Woodford County, ILIL38,111-0.9%−9.5 pts

30▲2Tazewell County, ILIL130,049-1.0%−4.9 pts

31▼11Madison County, ILIL263,110-1.0%−4.9 pts

32▼8Moultrie County, ILIL14,371-1.1%−3.6 pts

33▼15Sangamon County, ILIL194,170-1.1%−7.0 pts

34▲41Morgan County, ILIL32,515-1.2%−1.8 pts

35▲37Washington County, ILIL13,564-1.4%−2.7 pts

36▲52Stark County, ILIL5,319-1.5%+1.6 pts

37▼28Cook County, ILIL5,194,625-1.5%−6.9 pts

38▲32Jersey County, ILIL21,160-1.6%−7.1 pts

39▲59Hardin County, ILIL3,588-1.7%+5.8 pts

40▲19Hamilton County, ILIL7,859-1.7%−3.1 pts

41▲35Scott County, ILIL4,866-1.7%+0.2 pts

42▼4LaSalle County, ILIL107,773-1.7%−6.0 pts

43▼18Christian County, ILIL33,443-1.7%−4.5 pts

44▼16Peoria County, ILIL178,553-1.8%−2.1 pts

45▼38Carroll County, ILIL15,419-1.8%−1.0 pts

46▼9Wayne County, ILIL15,882-1.8%−1.3 pts

47▲8Kankakee County, ILIL105,525-1.8%−9.7 pts

48▼26Rock Island County, ILIL141,869-1.9%−2.4 pts

49▲17Shelby County, ILIL20,576-2.0%−4.8 pts

50▼20Jo Daviess County, ILIL21,594-2.0%−4.1 pts

51▲35Fulton County, ILIL32,901-2.1%−2.6 pts

52▲27Livingston County, ILIL35,057-2.1%−3.1 pts

53▲4Clark County, ILIL15,114-2.2%−9.0 pts

54▼1Bureau County, ILIL32,510-2.2%−1.7 pts

55▼32Adams County, ILIL64,267-2.2%−5.5 pts

56▲18Marshall County, ILIL11,473-2.3%−4.9 pts

57▲1Cumberland County, ILIL10,208-2.3%−7.8 pts

58▼13Franklin County, ILIL36,916-2.3%+0.9 pts

59▼19Ford County, ILIL13,216-2.3%−2.1 pts

60▼33Henry County, ILIL48,095-2.4%−2.1 pts

61▲39Pope County, ILIL3,672-2.4%−3.3 pts

62▲7De Witt County, ILIL15,118-2.6%−4.3 pts

63▼14St. Clair County, ILIL250,708-2.6%0.0 pts

64▼20Jefferson County, ILIL36,147-2.6%−10.8 pts

65▼3Macoupin County, ILIL43,748-2.7%−5.5 pts

66▼25Jasper County, ILIL9,032-2.7%+1.9 pts

67▼17Whiteside County, ILIL54,121-2.8%−3.6 pts

68▲9Logan County, ILIL27,182-2.9%−4.1 pts

69▼23Mercer County, ILIL15,229-3.0%−1.1 pts

70▲24Calhoun County, ILIL4,300-3.1%+1.4 pts

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

72▲12Edgar County, ILIL16,323-3.2%−3.8 pts

73▼42Fayette County, ILIL20,790-3.2%−7.6 pts

74▼41Union County, ILIL16,656-3.4%−7.2 pts

75▲7Iroquois County, ILIL26,150-3.4%−5.2 pts

76▲14Pike County, ILIL14,231-3.4%−2.3 pts

77▼42Menard County, ILIL11,863-3.5%−15.4 pts

78▲3Schuyler County, ILIL6,657-3.5%+0.6 pts

79▼37Marion County, ILIL36,382-3.6%−3.9 pts

80▼26Lee County, ILIL32,914-3.6%−8.5 pts

81▼29Warren County, ILIL16,222-3.6%−1.3 pts

82▼43Clay County, ILIL12,793-3.7%−4.4 pts

83▼15Perry County, ILIL20,160-3.7%−11.6 pts

84▼55Richland County, ILIL15,219-3.8%−1.4 pts

85▼2Vermilion County, ILIL71,259-3.9%+1.0 pts

86▼35Wabash County, ILIL10,907-4.0%−2.7 pts

87▼39Saline County, ILIL22,772-4.2%−4.9 pts

88▼28Knox County, ILIL47,767-4.4%−3.4 pts

89▼46Cass County, ILIL12,463-4.4%−6.4 pts

90▼25Macon County, ILIL99,300-4.5%−2.4 pts

91▼35White County, ILIL13,250-4.5%+2.4 pts

92▼14Hancock County, ILIL16,803-4.6%+1.2 pts

93▼13Massac County, ILIL13,502-4.7%−7.5 pts

94▲7McDonough County, ILIL25,916-4.9%+1.8 pts

95▼4Mason County, ILIL12,411-5.2%−3.7 pts

96▼23Edwards County, ILIL5,898-5.6%+0.7 pts

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

98▼3Henderson County, ILIL5,984-6.3%−7.8 pts

99▼7Gallatin County, ILIL4,616-6.7%0.0 pts

100▼1Pulaski County, ILIL4,820-7.2%−4.9 pts

101▼16Lawrence 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 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES