Resident Population in Grayson County, TX was 150.53200 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Grayson County, TX reached a record high of 150.53200 in January of 2024 and a record low of 77.00000 in January of 1972. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Grayson County, TX - last updated from the United States Federal Reserve on April of 2026.