White to Non-White Racial Dissimilarity (5-year estimate) Index for Washington County, IA was 42.82% 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, IA reached a record high of 45.65 in January of 2012 and a record low of 28.62 in January of 2017. 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, IA - last updated from the United States Federal Reserve on May of 2024.