White to Non-White Racial Dissimilarity (5-year estimate) Index for Decatur County, TN was 40.78% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Decatur County, TN reached a record high of 40.78 in January of 2022 and a record low of 20.82 in January of 2020. 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 Decatur County, TN - last updated from the United States Federal Reserve on May of 2024.