Unemployment Rate in Williamson County, TX was 3.30% in December of 2025, according to the United States Federal Reserve. Historically, Unemployment Rate in Williamson County, TX reached a record high of 10.90 in April of 2020 and a record low of 1.40 in December of 1999. Trading Economics provides the current actual value, an historical data chart and related indicators for Unemployment Rate in Williamson County, TX - last updated from the United States Federal Reserve on April of 2026.