Resident Population in Aiken County, SC was 179.24500 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Aiken County, SC reached a record high of 179.24500 in January of 2024 and a record low of 91.02300 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Aiken County, SC - last updated from the United States Federal Reserve on April of 2026.