High School Graduate or Higher (5-year estimate) in Mercer County, IL was 92.40% in January of 2022, according to the United States Federal Reserve. Historically, High School Graduate or Higher (5-year estimate) in Mercer County, IL reached a record high of 92.50 in January of 2021 and a record low of 88.10 in January of 2011. Trading Economics provides the current actual value, an historical data chart and related indicators for High School Graduate or Higher (5-year estimate) in Mercer County, IL - last updated from the United States Federal Reserve on June of 2024.