Resident Population in Grady County, OK was 58.35300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Grady County, OK reached a record high of 58.35300 in January of 2024 and a record low of 29.35400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Grady County, OK - last updated from the United States Federal Reserve on April of 2026.