White to Non-White Racial Dissimilarity (5-year estimate) Index for Decatur County, IA was 25.64% 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, IA reached a record high of 38.09 in January of 2019 and a record low of 19.43 in January of 2013. 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, IA - last updated from the United States Federal Reserve on May of 2024.