RANKING · 2020 CENSUS · 98 SHOWN OF 98

Largest Czech population, Iowa counties · 2020

Iowa 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 98 counties in Iowa that qualify, ranked against each other statewide. The median across all 98 is 154.

Czech Americans: full group profile →

IowaAll 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

01Linn County, IAIA232,02811,557−21%

02Johnson County, IAIA160,0445,3830%

03Polk County, IAIA516,5464,989+7%

04Black Hawk County, IAIA131,5322,011−14%

05Tama County, IAIA16,7961,609−23%

06Scott County, IAIA175,2591,486−19%

07Winneshiek County, IAIA19,7331,459+7%

08Pottawattamie County, IAIA92,9961,421−4%

09Benton County, IAIA26,0041,285−27%

10Howard County, IAIA9,4151,072−11%

11Woodbury County, IAIA106,649953−12%

12Story County, IAIA101,291858−45%

13Dallas County, IAIA118,457843+26%

14Cerro Gordo County, IAIA42,372788−32%

15Dubuque County, IAIA99,381781−7%

16Marshall County, IAIA39,890750−21%

17Warren County, IAIA57,331607+20%

18Webster County, IAIA36,838556−56%

19Muscatine County, IAIA41,853505+4%

20Iowa County, IAIA16,504500−45%

21Jones County, IAIA21,253491−48%

22Poweshiek County, IAIA18,368423−16%

23Cedar County, IAIA18,359418−46%

24Clinton County, IAIA46,002402−9%

25Chickasaw County, IAIA11,663382−27%

26Hancock County, IAIA10,528376−17%

27Delaware County, IAIA17,674364+129%

28Bremer County, IAIA25,296358−3%

29Fayette County, IAIA19,047321+2%

30Allamakee County, IAIA14,238313+72%

31Floyd County, IAIA14,901308+34%

32Mills County, IAIA14,793282−54%

33Sioux County, IAIA36,774273+78%

34Buchanan County, IAIA20,883268−20%

35Des Moines County, IAIA38,077264+103%

36Washington County, IAIA22,667243−63%

37Buena Vista County, IAIA20,449236+87%

38Cass County, IAIA12,960224+74%

39Jasper County, IAIA38,153205−46%

40Clayton County, IAIA16,845201−59%

41Carroll County, IAIA20,303190−12%

42Hardin County, IAIA16,455190−44%

43Mahaska County, IAIA21,880167+33%

44Plymouth County, IAIA25,697164−15%

45Crawford County, IAIA16,237162−42%

46Madison County, IAIA17,270161−41%

47Harrison County, IAIA14,623156−62%

48Marion County, IAIA34,192156−48%

49Boone County, IAIA26,799154−60%

50Pocahontas County, IAIA6,819152−50%

51Union County, IAIA11,829148−42%

52Keokuk County, IAIA9,797140+33%

53Grundy County, IAIA12,361137−49%

54Cherokee County, IAIA11,369136−6%

55Page County, IAIA14,856126+168%

56Henry County, IAIA19,349124−37%

57Ringgold County, IAIA4,642123+26%

58Butler County, IAIA14,049121−32%

59Dickinson County, IAIA18,077120−14%

60Winnebago County, IAIA10,251119−43%

61Emmet County, IAIA9,107114+70%

62Appanoose County, IAIA12,077108−41%

63Jackson County, IAIA19,288108−43%

64Mitchell County, IAIA10,650107−48%

65Wright County, IAIA12,801102−30%

66Worth County, IAIA7,338100−46%

67Clay County, IAIA16,20296+129%

68Shelby County, IAIA11,68994−14%

69Monona County, IAIA8,53991−54%

70Monroe County, IAIA7,40684+100%

71Guthrie County, IAIA10,78277+4%

72Lee County, IAIA32,30674−27%

73Jefferson County, IAIA15,29172−64%

74Clarke County, IAIA9,57469−9%

75Franklin County, IAIA9,86868−17%

76Louisa County, IAIA10,41666−40%

77Lucas County, IAIA8,84766+214%

78Wapello County, IAIA35,21065−65%

79Adams County, IAIA3,61764+49%

80Humboldt County, IAIA9,40964−53%

81Hamilton County, IAIA14,94457−74%

82Calhoun County, IAIA9,56255−35%

83Lyon County, IAIA12,35450+56%

84Kossuth County, IAIA14,32248−59%

85Montgomery County, IAIA10,00242−53%

86Fremont County, IAIA6,52238−63%

87Audubon County, IAIA5,50937+76%

88O'Brien County, IAIA14,22037−39%

89Decatur County, IAIA7,65536+500%

90Sac County, IAIA9,52534−57%

91Van Buren County, IAIA7,13127−27%

92Adair County, IAIA7,40322−83%

93Taylor County, IAIA5,83521−78%

94Palo Alto County, IAIA8,89921−82%

95Greene County, IAIA8,65820−81%

96Ida County, IAIA6,77719−46%

97Wayne County, IAIA6,7389−36%

98Osceola County, IAIA5,9807−77%

SHOWING 1–98 OF 98

Download CSV (full list, 98 rows)

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