Largest Irish population, South Dakota counties

South Dakota counties ranked by the number of residents who are 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 66 counties in South Dakota that qualify, ranked against each other statewide. The median across all 66 is 362. Biggest climber in the top 100 since 2020: Haakon County, SD, up 17 places to #34.