Ranking of Illinois Counties By Percentage of 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 (10.90% of Illinois population). Among all Illinois counties, LaSalle County had the highest percentage of its population with Irish ancestry (18.85%), followed by Grundy County (18.64%), and Jo Daviess County (17.18%).
The chart and table below shows the top 10 counties with high percentage of its population having 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 Percentage of Population with Irish Ancestry in 2021
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| Rank | County | Percentage of Pop. (%) |
|---|---|---|
| 1 | LaSalle County | 18.85 |
| 2 | Grundy County | 18.64 |
| 3 | Jo Daviess County | 17.18 |
| 4 | Livingston County | 16.97 |
| 5 | McHenry County | 16.22 |
| 6 | Lee County | 15.84 |
| 7 | Marshall County | 15.49 |
| 8 | DeKalb County | 15.12 |
| 9 | McLean County | 14.93 |
| 10 | Saline County | 14.69 |
| 11 | Iroquois County | 14.59 |
| 12 | Piatt County | 14.55 |
| 13 | Mason County | 14.51 |
| 14 | Massac County | 14.43 |
| 15 | Will County | 14.28 |
| 16 | Edgar County | 14.11 |
| 17 | DuPage County | 14.08 |
| 18 | Coles County | 14.01 |
| 19 | Pope County | 13.85 |
| 20 | Logan County | 13.81 |
| 21 | Ogle County | 13.78 |
| 22 | Knox County | 13.75 |
| 23 | Kendall County | 13.73 |
| 24 | Stark County | 13.69 |
| 25 | Hardin County | 13.62 |
| 26 | Menard County | 13.60 |
| 27 | Gallatin County | 13.56 |
| 28 | Jersey County | 13.54 |
| 29 | Hamilton County | 13.47 |
| 30 | White County | 13.26 |
| 31 | Henderson County | 13.20 |
| 31 | Madison County | 13.20 |
| 32 | Whiteside County | 13.18 |
| 33 | Bureau County | 13.02 |
| 34 | Woodford County | 12.73 |
| 35 | Carroll County | 12.65 |
| 36 | Clark County | 12.63 |
| 37 | Henry County | 12.55 |
| 38 | Scott County | 12.51 |
| 39 | Sangamon County | 12.47 |
| 40 | Williamson County | 12.41 |
| 41 | Boone County | 12.40 |
| 42 | Monroe County | 12.33 |
| 43 | De Witt County | 12.25 |
| 44 | Tazewell County | 12.22 |
| 45 | Macon County | 12.15 |
| 46 | Kankakee County | 12.11 |
| 47 | Macoupin County | 12.10 |
| 48 | McDonough County | 12.07 |
| 49 | Crawford County | 12.05 |
| 50 | Washington County | 12.00 |
| 51 | Clay County | 11.95 |
| 52 | Marion County | 11.90 |
| 53 | Fulton County | 11.88 |
| 54 | Bond County | 11.87 |
| 55 | Warren County | 11.77 |
| 56 | Montgomery County | 11.68 |
| 56 | Peoria County | 11.68 |
| 57 | Franklin County | 11.58 |
| 57 | Rock Island County | 11.58 |
| 58 | Ford County | 11.52 |
| 59 | Morgan County | 11.51 |
| 60 | Richland County | 11.46 |
| 61 | Putnam County | 11.41 |
| 62 | Winnebago County | 11.37 |
| 63 | Hancock County | 11.34 |
| 64 | Stephenson County | 11.21 |
| 65 | Wabash County | 11.07 |
| 66 | Kane County | 11.06 |
| 67 | Jefferson County | 10.89 |
| 68 | Schuyler County | 10.80 |
| 69 | Adams County | 10.62 |
| 70 | Lake County | 10.45 |
| 71 | Jackson County | 10.38 |
| 72 | Moultrie County | 10.35 |
| 73 | Mercer County | 10.23 |
| 74 | Christian County | 10.22 |
| 75 | Champaign County | 10.16 |
| 76 | Jasper County | 10.07 |
| 77 | Vermilion County | 10.03 |
| 78 | Edwards County | 10.01 |
| 79 | Effingham County | 9.99 |
| 80 | Wayne County | 9.95 |
| 81 | Union County | 9.83 |
| 82 | Johnson County | 9.60 |
| 83 | Perry County | 9.58 |
| 84 | Randolph County | 9.53 |
| 85 | Cumberland County | 9.49 |
| 86 | St. Clair County | 9.48 |
| 87 | Cass County | 9.44 |
| 88 | Douglas County | 9.29 |
| 89 | Greene County | 8.96 |
| 89 | Lawrence County | 8.96 |
| 90 | Pulaski County | 8.83 |
| 91 | Brown County | 8.78 |
| 92 | Cook County | 8.50 |
| 93 | Pike County | 8.22 |
| 94 | Fayette County | 7.66 |
| 95 | Clinton County | 7.53 |
| 96 | Shelby County | 7.43 |
| 97 | Alexander County | 7.42 |
| 98 | Calhoun County | 6.04 |
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