RANKING · 2010 CENSUS · 102 SHOWN OF 102

Fastest growing, Illinois counties · 2010

Illinois counties ranked by population growth from the 2000 census to 2010. 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+110.4%+187%

02Will County, ILIL712,253+34.9%−14%

03Grundy County, ILIL54,052+33.4%+108%

04Boone County, ILIL53,568+29.6%−17%

05Kane County, ILIL525,757+27.5%+1%

06Monroe County, ILIL34,840+19.3%−17%

07McHenry County, ILIL317,751+18.7%−55%

08DeKalb County, ILIL101,835+18.2%+28%

09McLean County, ILIL171,419+12.7%−23%

10Champaign County, ILIL209,972+11.9%+210%

11Kankakee County, ILIL105,525+9.3%+18%

12Lake County, ILIL719,339+9.2%−63%

13Woodford County, ILIL38,111+9.0%+4%

14Lawrence County, ILIL13,790+8.9%−375%

15Williamson County, ILIL67,225+8.3%+34%

16Clinton County, ILIL37,128+6.3%+34%

17Jersey County, ILIL21,160+6.1%+11%

18Winnebago County, ILIL283,674+6.1%−40%

19St. Clair County, ILIL250,708+5.5%−312%

20Tazewell County, ILIL130,049+5.4%+39%

21Schuyler County, ILIL6,657+4.9%−220%

22Ogle County, ILIL51,399+4.8%−56%

23Sangamon County, ILIL194,170+4.5%−24%

24Madison County, ILIL263,110+4.0%+3%

25Moultrie County, ILIL14,371+3.9%+53%

26Piatt County, ILIL16,791+2.2%−58%

27LaSalle County, ILIL107,773+2.2%−50%

28Massac County, ILIL13,502+1.8%−36%

29Menard County, ILIL11,863+1.8%−85%

30Jo Daviess County, ILIL21,594+1.7%−19%

31Peoria County, ILIL178,553+1.7%+403%

32Fayette County, ILIL20,790+1.6%−64%

33DuPage County, ILIL934,298+1.4%−91%

34Franklin County, ILIL36,916+1.4%−143%

35Pope County, ILIL3,672+1.3%+41%

36Coles County, ILIL46,607+1.3%−58%

37Jackson County, ILIL52,501+1.0%−143%

38Bond County, ILIL16,959+0.8%−96%

39Richland County, ILIL15,219+0.5%−122%

40Douglas County, ILIL19,880+0.3%−88%

41Calhoun County, ILIL4,300+0.1%−102%

42Effingham County, ILIL34,519-0.1%−101%

43Lee County, ILIL32,914-0.1%−102%

44Brown County, ILIL6,401-0.2%−101%

45Cass County, ILIL12,463-0.4%−120%

46McDonough County, ILIL25,916-0.9%−86%

47Henry County, ILIL48,095-1.0%+285%

48Ford County, ILIL13,216-1.1%+372%

49Rock Island County, ILIL141,869-1.2%−380%

50Randolph County, ILIL29,921-1.2%−38%

51Putnam County, ILIL5,619-1.3%−121%

52De Witt County, ILIL15,118-1.4%−183%

53Bureau County, ILIL32,510-1.5%+185%

54Christian County, ILIL33,443-1.6%−158%

55Adams County, ILIL64,267-1.7%−152%

56Montgomery County, ILIL28,076-1.8%+623%

57Cumberland County, ILIL10,208-1.8%−133%

58Livingston County, ILIL35,057-1.8%−291%

59Hamilton County, ILIL7,859-1.9%−233%

60Wayne County, ILIL15,882-2.3%+337%

61Johnson County, ILIL13,363-2.3%−117%

62Shelby County, ILIL20,576-2.3%−182%

63Macoupin County, ILIL43,748-2.6%−191%

64Stephenson County, ILIL43,220-2.6%−234%

65Union County, ILIL16,656-2.7%−169%

66Vermilion County, ILIL71,259-2.7%−44%

67Logan County, ILIL27,182-2.8%−325%

68Washington County, ILIL13,564-2.9%−333%

69Morgan County, ILIL32,515-2.9%−585%

70Jefferson County, ILIL36,147-3.0%−137%

71Mercer County, ILIL15,229-3.1%+60%

72Fulton County, ILIL32,901-3.1%−792%

73Crawford County, ILIL18,648-3.1%−161%

74Perry County, ILIL20,160-3.2%−141%

75Scott County, ILIL4,866-3.3%+73%

76Cook County, ILIL5,194,625-3.4%−164%

77Macon County, ILIL99,300-3.4%+61%

78Whiteside County, ILIL54,121-3.6%−558%

79Edwards County, ILIL5,898-3.6%−43%

80Clark County, ILIL15,114-4.0%−158%

81Marshall County, ILIL11,473-4.1%−258%

82Jasper County, ILIL9,032-4.1%−11%

83White County, ILIL13,250-4.6%−34%

84Hancock County, ILIL16,803-5.1%−14%

85Clay County, ILIL12,793-5.1%−840%

86Iroquois County, ILIL26,150-5.2%−390%

87Knox County, ILIL47,767-5.2%+429%

88Stark County, ILIL5,319-5.3%+73%

89Marion County, ILIL36,382-5.4%−1828%

90Warren County, ILIL16,222-5.5%+136%

91Pike County, ILIL14,231-5.5%+400%

92Edgar County, ILIL16,323-5.7%−1129%

93Greene County, ILIL11,313-5.9%+63%

94Saline County, ILIL22,772-6.8%−1093%

95Wabash County, ILIL10,907-7.7%+477%

96Carroll County, ILIL15,419-7.7%+890%

97Mason County, ILIL12,411-8.6%+502%

98Hardin County, ILIL3,588-10.0%+33%

99Henderson County, ILIL5,984-10.7%−843%

100Gallatin County, ILIL4,616-13.3%+98%

101Alexander County, ILIL4,570-14.1%+45%

102Pulaski County, ILIL4,820-16.2%+594%

SHOWING 1–102 OF 102

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