Unemployment Rate in King William County, VA was 2.70% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in King William County, VA reached a record high of 9.40 in April of 2020 and a record low of 1.40 in November of 1999. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in King William County, VA - last updated from the United States Federal Reserve on April of 2026.