Resident Population in Horry County, SC was 397.47800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Horry County, SC reached a record high of 397.47800 in January of 2023 and a record low of 69.99200 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Horry County, SC - last updated from the United States Federal Reserve on May of 2024.