Resident Population in Clayton County, GA was 297.70300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Clayton County, GA reached a record high of 299.44000 in January of 2020 and a record low of 98.12600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Clayton County, GA - last updated from the United States Federal Reserve on April of 2026.