Largest Czech population, Washington counties

Washington counties ranked by the number of residents who are Czech 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 39 counties in Washington that qualify, ranked against each other statewide. The median across all 39 is 226. Biggest climber in the top 100 since 2020: Jefferson County, WA, up 9 places to #12.