Largest Welsh population, South Dakota counties

South Dakota counties ranked by the number of residents who are Welsh 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 55 counties in South Dakota that qualify, ranked against each other statewide. The median across all 55 is 21. Biggest climber in the top 100 since 2020: Edmunds County, SD, up 37 places to #20.