Largest Welsh population, South Dakota cities

South Dakota cities 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 18 cities in South Dakota that qualify, ranked against each other statewide. The median across all 18 is 70. Biggest climber in the top 100 since 2020: Vermillion, SD, up 8 places to #3.