Resident Population in Somerset County, ME was 51.33800 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Somerset County, ME reached a record high of 52.21700 in January of 2010 and a record low of 40.59700 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Somerset County, ME - last updated from the United States Federal Reserve on April of 2026.