Income Inequality in Marion County, IL was 12.79307 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Marion County, IL reached a record high of 12.79307 in January of 2022 and a record low of 11.48764 in January of 2011. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Marion County, IL - last updated from the United States Federal Reserve on May of 2024.