Income Inequality in Rock Island County, IL was 13.15751 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Rock Island County, IL reached a record high of 13.38033 in January of 2021 and a record low of 12.10540 in January of 2012. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Rock Island County, IL - last updated from the United States Federal Reserve on May of 2024.