Unemployment Rate in Mason County, IL was 6.00% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Mason County, IL reached a record high of 14.90 in January of 2010 and a record low of 3.50 in April of 2025. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Mason County, IL - last updated from the United States Federal Reserve on April of 2026.