Unemployment Rate in Warren County, IL was 4.70% in March of 2024, according to the United States Federal Reserve. Historically, Unemployment Rate in Warren County, IL reached a record high of 10.50 in April of 2020 and a record low of 2.30 in May of 1998. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Warren County, IL - last updated from the United States Federal Reserve on May of 2024.