High School Graduate or Higher (5-year estimate) in Johnson County, IA was 96.00% in January of 2022, according to the United States Federal Reserve. Historically, High School Graduate or Higher (5-year estimate) in Johnson County, IA reached a record high of 96.20 in January of 2021 and a record low of 94.70 in January of 2016. Trading Economics provides the current actual value, an historical data chart and related indicators for High School Graduate or Higher (5-year estimate) in Johnson County, IA - last updated from the United States Federal Reserve on May of 2024.