Ranking of Washington Counties By Percentage of Population with Scotch Irish Ancestry in 2021

Based on the US Census ACS-5Yrs estimates, in 2021, there were 81.32K people in Washington with Scotch Irish ancestry (1.07% of Washington population). Among all Washington counties, Mason County had the highest percentage of its population with Scotch Irish ancestry (2.04%), followed by Klickitat County (1.99%), and San Juan County (1.88%).

The chart and table below shows the top 10 counties with high percentage of its population having Scotch Irish ancestry.

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