White to Non-White Racial Dissimilarity (5-year estimate) Index for Brookings County, SD was 18.36% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Brookings County, SD reached a record high of 21.92 in January of 2010 and a record low of 10.97 in January of 2018. 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 Brookings County, SD - last updated from the United States Federal Reserve on May of 2024.