Most six-figure households, Illinois counties

Illinois counties with the most households earning $100,000 or more, as of the 2024 American Community Survey. Ranked by number of households, not the share. This list covers the 102 counties in Illinois that qualify, ranked against each other statewide. The median across all 102 is 4,954. Biggest climber in the top 100 since 2020: Mercer County, IL, up 6 places to #61.