Resident Population in Mason County, KY was 16.84100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Mason County, KY reached a record high of 18.31400 in January of 1981 and a record low of 16.66500 in January of 1989. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Mason County, KY - last updated from the United States Federal Reserve on May of 2024.