White to Non-White Racial Dissimilarity (5-year estimate) Index for Union County, SD was 31.46% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Union County, SD reached a record high of 45.08 in January of 2021 and a record low of 16.73 in January of 2014. 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 Union County, SD - last updated from the United States Federal Reserve on May of 2024.