Largest Scotch-Irish population, Idaho counties

Idaho counties ranked by the number of residents who are Scotch-Irish ancestry, from the 2024 American Community Survey detailed-origin tables. Each list covers the full eligible universe; download the complete data as CSV. This list covers the 44 counties in Idaho that qualify, ranked against each other statewide. The median across all 44 is 128. Biggest climber in the top 100 since 2020: Lemhi County, ID, up 24 places to #18.