High School Graduate or Higher (5-year estimate) in Penobscot County, ME was 93.90% in January of 2022, according to the United States Federal Reserve. Historically, High School Graduate or Higher (5-year estimate) in Penobscot County, ME reached a record high of 93.90 in January of 2022 and a record low of 89.50 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 Penobscot County, ME - last updated from the United States Federal Reserve on May of 2024.