Largest Welsh population, South Carolina counties

South Carolina 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 46 counties in South Carolina that qualify, ranked against each other statewide. The median across all 46 is 222. Biggest climber in the top 100 since 2020: Marlboro County, SC, up 12 places to #22.