Resident Population in Mason County, TX was 3.93100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Mason County, TX reached a record high of 4.28700 in January of 2019 and a record low of 3.30000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Mason County, TX - last updated from the United States Federal Reserve on May of 2024.