Unemployment Rate in Jefferson County, IL was 5.60% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Jefferson County, IL reached a record high of 27.20 in April of 2020 and a record low of 3.60 in February of 2020. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Jefferson County, IL - last updated from the United States Federal Reserve on April of 2026.