Ranking of Delaware Counties By Percentage of Population with Irish Ancestry in 2021

Based on the US Census ACS-5Yrs estimates, in 2021, there were 139.62K people in Delaware with Irish ancestry (14.22% of Delaware population). Among all Delaware counties, Sussex County had the highest percentage of its population with Irish ancestry (16.10%), followed by New Castle County (13.72%), and Kent County (13.34%).

The chart and table below shows the top 3 counties with high percentage of its population having Irish ancestry.

You can see similar information for other states and for other ancestry groups in Delaware.