White to Non-White Racial Dissimilarity (5-year estimate) Index for Montgomery County, IA was 10.19% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Montgomery County, IA reached a record high of 49.11 in January of 2010 and a record low of 10.19 in January of 2022. 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 Montgomery County, IA - last updated from the United States Federal Reserve on May of 2024.