Resident Population in Aroostook County, ME was 66.77600 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Aroostook County, ME reached a record high of 95.60000 in January of 1977 and a record low of 66.77600 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Aroostook County, ME - last updated from the United States Federal Reserve on September of 2025.