Resident Population in Decatur County, GA was 29.39100 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Decatur County, GA reached a record high of 29.39100 in January of 2024 and a record low of 22.31000 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Decatur County, GA - last updated from the United States Federal Reserve on April of 2026.