RANKING · 2020 CENSUS · 101 SHOWN OF 101

Largest Welsh population, Illinois counties · 2020

Illinois counties ranked by the number of residents who are Welsh 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 101 counties in Illinois that qualify, ranked against each other statewide. The median across all 101 is 135.

Welsh 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

RANKPLACESTATEPOPWELSH POPULATIONVS 2010

01Cook County, ILIL5,194,62512,825−4%

02DuPage County, ILIL934,2983,261−26%

03Will County, ILIL712,2532,251−5%

04Lake County, ILIL719,3392,113−31%

05Madison County, ILIL263,1101,776−6%

06Kane County, ILIL525,7571,694−36%

07St. Clair County, ILIL250,7081,435−4%

08Peoria County, ILIL178,5531,423+15%

09Sangamon County, ILIL194,1701,382−11%

10Winnebago County, ILIL283,6741,321−5%

11McHenry County, ILIL317,7511,249−16%

12Champaign County, ILIL209,9721,222+4%

13Tazewell County, ILIL130,049965+74%

14McLean County, ILIL171,419960−23%

15Rock Island County, ILIL141,869931+47%

16Macon County, ILIL99,300922+89%

17Kendall County, ILIL145,470598−11%

18Kankakee County, ILIL105,525588+4%

19Williamson County, ILIL67,225550+22%

20DeKalb County, ILIL101,835507−6%

21Coles County, ILIL46,607497+83%

22Vermilion County, ILIL71,259458−26%

23Jackson County, ILIL52,501440+67%

24Adams County, ILIL64,267372+60%

25Franklin County, ILIL36,916360+44%

26LaSalle County, ILIL107,773360−35%

27Montgomery County, ILIL28,076335+276%

28Boone County, ILIL53,568334+21%

29Woodford County, ILIL38,111312+37%

30Henry County, ILIL48,095308+4%

31Saline County, ILIL22,772288−8%

32Fulton County, ILIL32,901280−17%

33Bureau County, ILIL32,510278+85%

34Stephenson County, ILIL43,220269+57%

35Iroquois County, ILIL26,150268+76%

36Morgan County, ILIL32,515268+137%

37Perry County, ILIL20,160233+17%

38Piatt County, ILIL16,791232+161%

39Knox County, ILIL47,767226−37%

40Macoupin County, ILIL43,748217−15%

41Jefferson County, ILIL36,147216+10%

42Logan County, ILIL27,182214+16%

43Bond County, ILIL16,959198+41%

44Jo Daviess County, ILIL21,594188+9%

45Ogle County, ILIL51,399186+19%

46Whiteside County, ILIL54,121182+60%

47Randolph County, ILIL29,921173+45%

48Monroe County, ILIL34,840162+46%

49Warren County, ILIL16,222152+37%

50Christian County, ILIL33,443145+28%

51Grundy County, ILIL54,052135−72%

52Effingham County, ILIL34,519128+32%

53Clark County, ILIL15,114124−9%

54Richland County, ILIL15,219123+208%

55Marion County, ILIL36,382121−65%

56Douglas County, ILIL19,880118+20%

57Mason County, ILIL12,411110+450%

58Hancock County, ILIL16,803103−4%

59Lee County, ILIL32,914101−29%

60Livingston County, ILIL35,05799−44%

61Lawrence County, ILIL13,79094+92%

62Menard County, ILIL11,86394+32%

63Marshall County, ILIL11,47393−21%

64Clay County, ILIL12,79389+56%

65Hamilton County, ILIL7,85989+2867%

66Mercer County, ILIL15,22989−28%

67Moultrie County, ILIL14,37189+25%

68Washington County, ILIL13,56489−67%

69Union County, ILIL16,65688−32%

70White County, ILIL13,25083−24%

71McDonough County, ILIL25,91682−69%

72Crawford County, ILIL18,64875−51%

73Henderson County, ILIL5,98472+300%

74Clinton County, ILIL37,12871−27%

75Shelby County, ILIL20,57661−35%

76Jersey County, ILIL21,16059−16%

77Wayne County, ILIL15,88257+128%

78Fayette County, ILIL20,79052−42%

79Ford County, ILIL13,21650+79%

80Jasper County, ILIL9,03250−42%

81Carroll County, ILIL15,41942−22%

82De Witt County, ILIL15,11842−61%

83Edgar County, ILIL16,32340−31%

84Wabash County, ILIL10,90739−9%

85Edwards County, ILIL5,89838−40%

86Schuyler County, ILIL6,65738+36%

87Gallatin County, ILIL4,61637+42%

88Johnson County, ILIL13,36337+32%

89Alexander County, ILIL4,57030+25%

90Cass County, ILIL12,46329−15%

91Putnam County, ILIL5,61929−19%

92Cumberland County, ILIL10,20827−73%

93Hardin County, ILIL3,58825−48%

94Greene County, ILIL11,31323−83%

95Pope County, ILIL3,67223−12%

96Pulaski County, ILIL4,82023+667%

97Brown County, ILIL6,40122–

98Stark County, ILIL5,31915−74%

99Pike County, ILIL14,2318−92%

100Scott County, ILIL4,8666−86%

101Calhoun County, ILIL4,3004+33%

SHOWING 1–101 OF 101

Download CSV (full list, 101 rows)

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