Resident Population in Allegany County, MD was 67.27300 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Allegany County, MD reached a record high of 84.80000 in January of 1972 and a record low of 67.26700 in January of 2022. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Allegany County, MD - last updated from the United States Federal Reserve on May of 2024.