Largest Irish population, South Carolina counties

South Carolina 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 46 counties in South Carolina that qualify, ranked against each other statewide. The median across all 46 is 3,720. Biggest climber in the top 100 since 2020: Colleton County, SC, up 8 places to #24.