High School Graduate or Higher (5-year estimate) in Rock Island County, IL was 89.60% in January of 2022, according to the United States Federal Reserve. Historically, High School Graduate or Higher (5-year estimate) in Rock Island County, IL reached a record high of 89.60 in January of 2022 and a record low of 86.70 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 Rock Island County, IL - last updated from the United States Federal Reserve on May of 2024.