Resident Population in Garrett County, MD was 28.42300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Garrett County, MD reached a record high of 30.15800 in January of 2011 and a record low of 21.47600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Garrett County, MD - last updated from the United States Federal Reserve on May of 2024.