White to Non-White Racial Dissimilarity (5-year estimate) Index for Rock Island County, IL was 33.31% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Rock Island County, IL reached a record high of 38.42 in January of 2009 and a record low of 32.65 in January of 2017. 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 Rock Island County, IL - last updated from the United States Federal Reserve on June of 2024.