White to Non-White Racial Dissimilarity (5-year estimate) Index for Buchanan County, IA was 43.20% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Buchanan County, IA reached a record high of 43.20 in January of 2022 and a record low of 15.30 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 Buchanan County, IA - last updated from the United States Federal Reserve on May of 2024.