High School Graduate or Higher (5-year estimate) in Boone County, IL was 86.60% in January of 2022, according to the United States Federal Reserve. Historically, High School Graduate or Higher (5-year estimate) in Boone County, IL reached a record high of 87.10 in January of 2021 and a record low of 85.40 in January of 2010. Trading Economics provides the current actual value, an historical data chart and related indicators for High School Graduate or Higher (5-year estimate) in Boone County, IL - last updated from the United States Federal Reserve on May of 2024.