White to Non-White Racial Dissimilarity (5-year estimate) Index for Williamson County, TX was 24.04% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Williamson County, TX reached a record high of 28.56 in January of 2012 and a record low of 23.16 in January of 2019. Trading Economics provides the current actual value, an historical data chart and related indicators for White to Non-White Racial Dissimilarity (5-year estimate) Index for Williamson County, TX - last updated from the United States Federal Reserve on May of 2024.