White to Non-White Racial Dissimilarity (5-year estimate) Index for Gregory County, SD was 49.84% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Gregory County, SD reached a record high of 55.20 in January of 2021 and a record low of 2.47 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 Gregory County, SD - last updated from the United States Federal Reserve on May of 2024.