RANKING · 2020 CENSUS · 102 SHOWN OF 102

Largest Irish population, Illinois counties · 2020

Illinois counties ranked by the number of residents who are Irish 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 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 2,939.

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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

RANKPLACESTATEPOPIRISH POPULATIONVS 2010

01Cook County, ILIL5,194,625448,570−14%

02DuPage County, ILIL934,298129,954−14%

03Will County, ILIL712,253101,054−19%

04Lake County, ILIL719,33974,175−17%

05Kane County, ILIL525,75759,742−9%

06McHenry County, ILIL317,75151,182−11%

07Madison County, ILIL263,11034,165−14%

08Winnebago County, ILIL283,67433,453−16%

09McLean County, ILIL171,41925,319−1%

10Sangamon County, ILIL194,17024,571−15%

11St. Clair County, ILIL250,70823,760−19%

12Champaign County, ILIL209,97222,179−8%

13Peoria County, ILIL178,55321,739−21%

14LaSalle County, ILIL107,77319,584−9%

15Kendall County, ILIL145,47018,250+8%

16Rock Island County, ILIL141,86917,602−16%

17Tazewell County, ILIL130,04916,108−16%

18DeKalb County, ILIL101,83515,443−15%

19Kankakee County, ILIL105,52513,952−12%

20Macon County, ILIL99,30012,961−9%

21Grundy County, ILIL54,0529,206−18%

22Williamson County, ILIL67,2258,260−27%

23Vermilion County, ILIL71,2597,539−9%

24Knox County, ILIL47,7677,437−5%

25Adams County, ILIL64,2677,316−17%

26Whiteside County, ILIL54,1217,059−22%

27Ogle County, ILIL51,3997,050−14%

28Coles County, ILIL46,6076,547−25%

29Henry County, ILIL48,0956,414−13%

30Livingston County, ILIL35,0576,267−7%

31Boone County, ILIL53,5686,224−15%

32Jackson County, ILIL52,5016,151−29%

33Lee County, ILIL32,9145,279−22%

34Macoupin County, ILIL43,7485,245−33%

35Franklin County, ILIL36,9164,791−35%

36Stephenson County, ILIL43,2204,616−23%

37Marion County, ILIL36,3824,576−27%

38Woodford County, ILIL38,1114,406−18%

39Jefferson County, ILIL36,1474,332−30%

40Logan County, ILIL27,1824,248+6%

41Bureau County, ILIL32,5104,195−13%

42Iroquois County, ILIL26,1504,078−4%

43Monroe County, ILIL34,8404,012−25%

44Morgan County, ILIL32,5153,874−30%

45Fulton County, ILIL32,9013,829−22%

46Jo Daviess County, ILIL21,5943,689−17%

47Saline County, ILIL22,7723,528−21%

48McDonough County, ILIL25,9163,520−21%

49Effingham County, ILIL34,5193,4110%

50Christian County, ILIL33,4433,201−28%

51Montgomery County, ILIL28,0762,939−13%

52Clinton County, ILIL37,1282,876−21%

53Randolph County, ILIL29,9212,855−25%

54Jersey County, ILIL21,1602,795−17%

55Piatt County, ILIL16,7912,503+12%

56Edgar County, ILIL16,3232,480−13%

57Bond County, ILIL16,9592,217+22%

58Crawford County, ILIL18,6482,200−10%

59Warren County, ILIL16,2222,183−16%

60De Witt County, ILIL15,1182,132+4%

61Clark County, ILIL15,1142,021−14%

62Douglas County, ILIL19,8802,020−5%

63Mason County, ILIL12,4112,004+31%

64White County, ILIL13,2501,992−15%

65Richland County, ILIL15,2191,886+26%

66Marshall County, ILIL11,4731,848−13%

67Carroll County, ILIL15,4191,809−17%

68Fayette County, ILIL20,7901,779−13%

69Mercer County, ILIL15,2291,769−41%

70Menard County, ILIL11,8631,754−11%

71Ford County, ILIL13,2161,731−21%

72Wayne County, ILIL15,8821,707+3%

73Hancock County, ILIL16,8031,663−29%

74Massac County, ILIL13,5021,581−37%

75Perry County, ILIL20,1601,575−51%

76Clay County, ILIL12,7931,515−13%

77Union County, ILIL16,6561,486−34%

78Lawrence County, ILIL13,7901,446−10%

79Shelby County, ILIL20,5761,350−31%

80Greene County, ILIL11,3131,347−35%

81Washington County, ILIL13,5641,328−32%

82Pike County, ILIL14,2311,314−41%

83Moultrie County, ILIL14,3711,310−26%

84Cass County, ILIL12,4631,238−15%

85Wabash County, ILIL10,9071,237+22%

86Hamilton County, ILIL7,8591,057−39%

87Johnson County, ILIL13,3631,036−29%

88Cumberland County, ILIL10,2081,032−21%

89Gallatin County, ILIL4,616945−29%

90Jasper County, ILIL9,032945−12%

91Stark County, ILIL5,319839−11%

92Schuyler County, ILIL6,657838−7%

93Henderson County, ILIL5,984783−27%

94Putnam County, ILIL5,619647−35%

95Brown County, ILIL6,401611−30%

96Edwards County, ILIL5,898585+4%

97Scott County, ILIL4,866568−35%

98Hardin County, ILIL3,588539−54%

99Pope County, ILIL3,672410−52%

100Pulaski County, ILIL4,820373−12%

101Calhoun County, ILIL4,300338−47%

102Alexander County, ILIL4,570332−42%

SHOWING 1–102 OF 102

Download CSV (full list, 102 rows)

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