Income Inequality in Williamson County, IL was 14.26271 Ratio in January of 2022, according to the United States Federal Reserve. Historically, Income Inequality in Williamson County, IL reached a record high of 14.26271 in January of 2022 and a record low of 12.42651 in January of 2013. Trading Economics provides the current actual value, an historical data chart and related indicators for Income Inequality in Williamson County, IL - last updated from the United States Federal Reserve on May of 2024.