White to Non-White Racial Dissimilarity (5-year estimate) Index for Island County, WA was 38.70% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Island County, WA reached a record high of 43.51 in January of 2018 and a record low of 34.24 in January of 2010. 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 Island County, WA - last updated from the United States Federal Reserve on May of 2024.