Resident Population in Williamsburg County, SC was 29.89100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Williamsburg County, SC reached a record high of 38.60000 in January of 1979 and a record low of 29.89100 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Williamsburg County, SC - last updated from the United States Federal Reserve on May of 2024.