Income Inequality in Mercer County, IL was 11.29573 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Mercer County, IL reached a record high of 11.29573 in January of 2022 and a record low of 8.97939 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Mercer County, IL - last updated from the United States Federal Reserve on May of 2024.