RANKING · 2020 CENSUS · 96 SHOWN OF 96

Largest Czech population, Illinois counties · 2020

Illinois counties ranked by the number of residents who are Czech ancestry, from the 2020 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 96 counties in Illinois that qualify, ranked against each other statewide. The median across all 96 is 93.

Czech Americans: full group profile →

IllinoisAll states All rankings

SAME RANKING BYCities States Metros

RELATEDLargest American population Highest American population share Largest Arab population Highest Arab population share Largest Egyptian population Highest Egyptian population share

YEAR2010 2020 2024

RANKPLACESTATEPOPCZECH POPULATIONVS 2010

01Cook County, ILIL5,194,62536,238−26%

02DuPage County, ILIL934,29817,251−26%

03Will County, ILIL712,2539,743−24%

04Lake County, ILIL719,3395,512−20%

05Kane County, ILIL525,7574,872−20%

06McHenry County, ILIL317,7514,065−28%

07Kendall County, ILIL145,4701,544−26%

08Madison County, ILIL263,1101,316−24%

09Winnebago County, ILIL283,6741,205−26%

10DeKalb County, ILIL101,8351,029−13%

11LaSalle County, ILIL107,773902−10%

12McLean County, ILIL171,419891−14%

13St. Clair County, ILIL250,708856−39%

14Champaign County, ILIL209,972834−12%

15Rock Island County, ILIL141,869813−18%

16Sangamon County, ILIL194,170681−18%

17Peoria County, ILIL178,553579−47%

18Grundy County, ILIL54,052561−43%

19Kankakee County, ILIL105,525549−20%

20Boone County, ILIL53,568476+25%

21Livingston County, ILIL35,057353+103%

22Tazewell County, ILIL130,049338−44%

23Macon County, ILIL99,300306+19%

24Woodford County, ILIL38,111287+71%

25Henry County, ILIL48,095275−18%

26Stephenson County, ILIL43,220264−3%

27Jo Daviess County, ILIL21,594252+121%

28Jackson County, ILIL52,501201−18%

29Lee County, ILIL32,914195−24%

30Whiteside County, ILIL54,121188−58%

31Coles County, ILIL46,607185+19%

32Knox County, ILIL47,767185−8%

33Ogle County, ILIL51,399182−67%

34Jersey County, ILIL21,160170+325%

35Monroe County, ILIL34,840137−52%

36Bureau County, ILIL32,510130−27%

37Vermilion County, ILIL71,259123−47%

38Iroquois County, ILIL26,150121+26%

39Piatt County, ILIL16,791116+14%

40Bond County, ILIL16,959109+148%

41Williamson County, ILIL67,225109−72%

42McDonough County, ILIL25,916108−33%

43Morgan County, ILIL32,515105−45%

44Logan County, ILIL27,182102−23%

45Mercer County, ILIL15,22999−46%

46Marion County, ILIL36,38296+4%

47Macoupin County, ILIL43,74894−65%

48Jefferson County, ILIL36,14793+43%

49Fulton County, ILIL32,90183−45%

50Moultrie County, ILIL14,37178+271%

51Clinton County, ILIL37,12873−28%

52Montgomery County, ILIL28,07661−71%

53Adams County, ILIL64,26759−67%

54Clark County, ILIL15,11459+436%

55Crawford County, ILIL18,64858+45%

56Perry County, ILIL20,16058+45%

57Menard County, ILIL11,86357+58%

58Effingham County, ILIL34,51954+238%

59Randolph County, ILIL29,92154−19%

60Washington County, ILIL13,56454+200%

61Ford County, ILIL13,21653+29%

62Franklin County, ILIL36,91652−55%

63Carroll County, ILIL15,41950−79%

64Douglas County, ILIL19,88042+600%

65Shelby County, ILIL20,57642−45%

66Hancock County, ILIL16,80338−55%

67Christian County, ILIL33,44336−81%

68Union County, ILIL16,65632−53%

69Massac County, ILIL13,50229−58%

70Marshall County, ILIL11,47328−76%

71Schuyler County, ILIL6,65723–

72Richland County, ILIL15,21922+83%

73Pike County, ILIL14,23121+600%

74Putnam County, ILIL5,61920+233%

75Fayette County, ILIL20,79019−81%

76Johnson County, ILIL13,36319−53%

77Henderson County, ILIL5,98418−53%

78De Witt County, ILIL15,11818+200%

79Lawrence County, ILIL13,79012+71%

80Warren County, ILIL16,22212−66%

81Hamilton County, ILIL7,85911−63%

82Jasper County, ILIL9,03211−65%

83Calhoun County, ILIL4,30010−41%

84Cumberland County, ILIL10,20810−78%

85Wabash County, ILIL10,90710−57%

86Saline County, ILIL22,7729−63%

87Alexander County, ILIL4,5709−78%

88Wayne County, ILIL15,8829−53%

89Clay County, ILIL12,7938–

90Brown County, ILIL6,4017–

91Edwards County, ILIL5,8985−58%

92Mason County, ILIL12,4115−58%

93Greene County, ILIL11,3134−33%

94Pope County, ILIL3,6723−94%

95Scott County, ILIL4,8662−67%

96Cass County, ILIL12,4631−96%

SHOWING 1–96 OF 96

Download CSV (full list, 96 rows)

UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS