White to Non-White Racial Dissimilarity (5-year estimate) Index for McCook County, SD was 5.60% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for McCook County, SD reached a record high of 42.63 in January of 2012 and a record low of 4.88 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 McCook County, SD - last updated from the United States Federal Reserve on June of 2024.