Largest Finnish population, South Dakota counties

South Dakota counties ranked by the number of residents who are Finnish 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 43 counties in South Dakota that qualify, ranked against each other statewide. The median across all 43 is 20. Biggest climber in the top 100 since 2020: Lake County, SD, up 21 places to #16.