Largest Bulgarian population, Illinois counties

Illinois counties ranked by the number of residents who are Bulgarian 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 32 counties in Illinois that qualify, ranked against each other statewide. The median across all 32 is 35. Biggest climber in the top 100 since 2020: St. Clair County, IL, up 14 places to #13.