Largest Costa Rican population, Illinois counties

Illinois counties ranked by the number of residents who are Costa Rican origin, 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 20 counties in Illinois that qualify, ranked against each other statewide. The median across all 20 is 42. Biggest climber in the top 100 since 2020: Will County, IL, up 9 places to #2.