White to Non-White Racial Dissimilarity (5-year estimate) Index for Montgomery County, IL was 47.61% 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, IL reached a record high of 66.92 in January of 2012 and a record low of 47.61 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, IL - last updated from the United States Federal Reserve on May of 2024.