RANKING · 2010 CENSUS · 102 SHOWN OF 102

Most population gained, Illinois counties · 2010

Illinois counties that added the most residents from the 2000 census to 2010, by raw count of people rather than percentage. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide.

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IllinoisAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Will County, ILIL712,253+175,294+21%

02Kane County, ILIL525,757+111,150+28%

03Kendall County, ILIL145,470+60,192+298%

04Lake County, ILIL719,339+59,106−54%

05McHenry County, ILIL317,751+48,683−37%

06Champaign County, ILIL209,972+21,412+222%

07McLean County, ILIL171,419+19,139−10%

08Winnebago County, ILIL283,674+16,848−34%

09DeKalb County, ILIL101,835+16,191+47%

10St. Clair County, ILIL250,708+13,974−306%

11DuPage County, ILIL934,298+12,763−90%

12Grundy County, ILIL54,052+12,528+141%

13Boone County, ILIL53,568+12,379+13%

14Madison County, ILIL263,110+10,341+7%

15Kankakee County, ILIL105,525+9,616+27%

16Sangamon County, ILIL194,170+8,514−19%

17Tazewell County, ILIL130,049+6,909+44%

18Monroe County, ILIL34,840+5,338+3%

19Williamson County, ILIL67,225+5,061+42%

20Woodford County, ILIL38,111+3,195+13%

21Peoria County, ILIL178,553+3,061+405%

22Ogle County, ILIL51,399+2,465−51%

23LaSalle County, ILIL107,773+2,415−47%

24Clinton County, ILIL37,128+2,227+40%

25Lawrence County, ILIL13,790+1,381−366%

26Jersey County, ILIL21,160+1,317+17%

27Coles County, ILIL46,607+677−56%

28Jackson County, ILIL52,501+606−142%

29Moultrie County, ILIL14,371+559+57%

30Franklin County, ILIL36,916+543−142%

31Jo Daviess County, ILIL21,594+389−17%

32Piatt County, ILIL16,791+364−55%

33Schuyler County, ILIL6,657+355−215%

34Fayette County, ILIL20,790+338−63%

35Massac County, ILIL13,502+268−34%

36Menard County, ILIL11,863+219−83%

37Bond County, ILIL16,959+135−95%

38Richland County, ILIL15,219+84−121%

39Douglas County, ILIL19,880+58−87%

40Pope County, ILIL3,672+57+43%

41Calhoun County, ILIL4,300+5−102%

42Brown County, ILIL6,401-13−101%

43Effingham County, ILIL34,519-22−101%

44Lee County, ILIL32,914-31−102%

45Cass County, ILIL12,463-53−121%

46Putnam County, ILIL5,619-80−122%

47Ford County, ILIL13,216-160+371%

48Hamilton County, ILIL7,859-164−234%

49Scott County, ILIL4,866-182+70%

50Cumberland County, ILIL10,208-205−135%

51De Witt County, ILIL15,118-237−184%

52Edwards County, ILIL5,898-250−47%

53Johnson County, ILIL13,363-296−119%

54McDonough County, ILIL25,916-301−87%

55Stark County, ILIL5,319-338+67%

56Wayne County, ILIL15,882-391+334%

57Randolph County, ILIL29,921-417−40%

58Jasper County, ILIL9,032-419−15%

59Washington County, ILIL13,564-432−336%

60Hardin County, ILIL3,588-480+23%

61Union County, ILIL16,656-485−172%

62Mercer County, ILIL15,229-523+57%

63Bureau County, ILIL32,510-525+184%

64Shelby County, ILIL20,576-530−184%

65Henry County, ILIL48,095-534+284%

66Marshall County, ILIL11,473-540−262%

67Montgomery County, ILIL28,076-548+621%

68Christian County, ILIL33,443-572−160%

69Crawford County, ILIL18,648-635−164%

70Clark County, ILIL15,114-673−162%

71White County, ILIL13,250-706−39%

72Livingston County, ILIL35,057-728−293%

73Perry County, ILIL20,160-744−144%

74Clay County, ILIL12,793-745−845%

75Gallatin County, ILIL4,616-856+84%

76Greene County, ILIL11,313-875+57%

77Logan County, ILIL27,182-878−328%

78Henderson County, ILIL5,984-882−854%

79Pike County, ILIL14,231-954+394%

80Wabash County, ILIL10,907-990+469%

81Hancock County, ILIL16,803-1,017−19%

82Warren County, ILIL16,222-1,028+130%

83Morgan County, ILIL32,515-1,069−588%

84Edgar County, ILIL16,323-1,128−1135%

85Adams County, ILIL64,267-1,174−154%

86Fulton County, ILIL32,901-1,181−795%

87Pulaski County, ILIL4,820-1,187+578%

88Jefferson County, ILIL36,147-1,218−140%

89Macoupin County, ILIL43,748-1,254−194%

90Stephenson County, ILIL43,220-1,268−237%

91Carroll County, ILIL15,419-1,287+882%

92Alexander County, ILIL4,570-1,352+31%

93Mason County, ILIL12,411-1,372+494%

94Iroquois County, ILIL26,150-1,616−395%

95Saline County, ILIL22,772-1,820−1100%

96Rock Island County, ILIL141,869-1,828−381%

97Whiteside County, ILIL54,121-2,155−561%

98Marion County, ILIL36,382-2,254−1834%

99Vermilion County, ILIL71,259-2,294−47%

100Knox County, ILIL47,767-2,917+424%

101Macon County, ILIL99,300-3,938+58%

102Cook County, ILIL5,194,625-182,066−167%

SHOWING 1–102 OF 102

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