Resident Population in King William County, VA was 19.03000 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in King William County, VA reached a record high of 19.03000 in January of 2023 and a record low of 7.40000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in King William County, VA - last updated from the United States Federal Reserve on May of 2024.