Estimated Percent of People of All Ages in Poverty for Williamson County, IL was 12.70% in January of 2022, according to the United States Federal Reserve. Historically, Estimated Percent of People of All Ages in Poverty for Williamson County, IL reached a record high of 18.50 in January of 2008 and a record low of 12.70 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Estimated Percent of People of All Ages in Poverty for Williamson County, IL - last updated from the United States Federal Reserve on May of 2024.