Ranking of Illinois Counties By Population with Irish Ancestry in 2021
Updated on April 16, 2025.
Based on the US Census ACS-5Yrs estimates, in 2021, there were 1.40M people in Illinois with Irish ancestry. Among all Illinois counties, Cook County had the highest population with Irish ancestry (447.38K), followed by DuPage County (131.48K), and Will County (99.42K).
The chart and table below shows the top 10 counties with high number of people with Irish ancestry.
You can see similar information for other states and for other ancestry groups in Illinois.
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Related Topics: Illinois ACS-5Yrs Estimates, 2021 Topic List.
Data Source: US Census Bureau.
Ranking of Illinois Counties By Population with Irish Ancestry in 2021
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| Rank | County | Population |
|---|---|---|
| 1 | Cook County | 447375 |
| 2 | DuPage County | 131484 |
| 3 | Will County | 99417 |
| 4 | Lake County | 74683 |
| 5 | Kane County | 57343 |
| 6 | McHenry County | 50394 |
| 7 | Madison County | 35117 |
| 8 | Winnebago County | 32456 |
| 9 | McLean County | 25603 |
| 10 | Sangamon County | 24531 |
| 11 | St. Clair County | 24525 |
| 12 | Peoria County | 21305 |
| 13 | Champaign County | 20994 |
| 14 | LaSalle County | 20731 |
| 15 | Kendall County | 17956 |
| 16 | Rock Island County | 16758 |
| 17 | Tazewell County | 16127 |
| 18 | DeKalb County | 15256 |
| 19 | Kankakee County | 13092 |
| 20 | Macon County | 12673 |
| 21 | Grundy County | 9761 |
| 22 | Williamson County | 8345 |
| 23 | Vermilion County | 7517 |
| 24 | Whiteside County | 7370 |
| 25 | Ogle County | 7135 |
| 26 | Adams County | 6999 |
| 27 | Knox County | 6900 |
| 28 | Coles County | 6659 |
| 29 | Boone County | 6644 |
| 30 | Henry County | 6201 |
| 31 | Livingston County | 6094 |
| 32 | Jackson County | 5571 |
| 33 | Macoupin County | 5463 |
| 34 | Lee County | 5446 |
| 35 | Stephenson County | 5023 |
| 36 | Woodford County | 4909 |
| 37 | Marion County | 4495 |
| 38 | Franklin County | 4409 |
| 39 | Bureau County | 4341 |
| 40 | Monroe County | 4284 |
| 41 | Jefferson County | 4068 |
| 42 | Fulton County | 4041 |
| 43 | Iroquois County | 3991 |
| 44 | Logan County | 3899 |
| 45 | Morgan County | 3819 |
| 46 | Jo Daviess County | 3779 |
| 47 | Saline County | 3506 |
| 48 | Christian County | 3477 |
| 49 | Effingham County | 3455 |
| 50 | McDonough County | 3348 |
| 51 | Montgomery County | 3327 |
| 52 | Randolph County | 2918 |
| 53 | Jersey County | 2916 |
| 54 | Clinton County | 2789 |
| 55 | Piatt County | 2425 |
| 56 | Edgar County | 2399 |
| 57 | Crawford County | 2268 |
| 58 | Massac County | 2061 |
| 59 | Perry County | 2027 |
| 60 | Hancock County | 2012 |
| 61 | Bond County | 1995 |
| 62 | Warren County | 1987 |
| 63 | Carroll County | 1972 |
| 64 | Clark County | 1968 |
| 65 | Mason County | 1919 |
| 66 | De Witt County | 1917 |
| 67 | White County | 1851 |
| 68 | Douglas County | 1831 |
| 69 | Marshall County | 1825 |
| 70 | Richland County | 1819 |
| 71 | Union County | 1696 |
| 72 | Menard County | 1679 |
| 73 | Washington County | 1659 |
| 74 | Fayette County | 1647 |
| 75 | Wayne County | 1616 |
| 76 | Mercer County | 1614 |
| 77 | Clay County | 1591 |
| 78 | Shelby County | 1572 |
| 79 | Ford County | 1565 |
| 80 | Moultrie County | 1514 |
| 81 | Lawrence County | 1386 |
| 82 | Johnson County | 1271 |
| 83 | Wabash County | 1264 |
| 84 | Cass County | 1232 |
| 85 | Pike County | 1226 |
| 86 | Greene County | 1092 |
| 87 | Hamilton County | 1080 |
| 88 | Cumberland County | 999 |
| 89 | Jasper County | 939 |
| 90 | Henderson County | 856 |
| 91 | Schuyler County | 751 |
| 92 | Stark County | 744 |
| 93 | Gallatin County | 683 |
| 94 | Putnam County | 643 |
| 95 | Edwards County | 624 |
| 96 | Scott County | 616 |
| 97 | Brown County | 556 |
| 98 | Pope County | 529 |
| 99 | Hardin County | 504 |
| 100 | Pulaski County | 466 |
| 101 | Alexander County | 407 |
| 102 | Calhoun County | 274 |
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