Largest Scotch-Irish population, South Dakota counties

South Dakota 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 57 counties in South Dakota that qualify, ranked against each other statewide. The median across all 57 is 24. Biggest climber in the top 100 since 2020: Spink County, SD, up 31 places to #20.