White to Non-White Racial Dissimilarity (5-year estimate) Index for Washington County, IL was 25.15% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Washington County, IL reached a record high of 37.07 in January of 2021 and a record low of 5.58 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 Washington County, IL - last updated from the United States Federal Reserve on May of 2024.