Resident Population in McCormick County, SC was 9.98300 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in McCormick County, SC reached a record high of 10.21000 in January of 2010 and a record low of 7.39800 in January of 1981. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in McCormick County, SC - last updated from the United States Federal Reserve on April of 2026.