Largest Scotch-Irish population, Montana counties

Montana counties ranked by the number of residents who are Scotch-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 56 counties in Montana that qualify, ranked against each other statewide. The median across all 56 is 62. Biggest climber in the top 100 since 2020: Broadwater County, MT, up 21 places to #13.