White to Non-White Racial Dissimilarity (5-year estimate) Index for St. Clair County, IL was 46.27% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for St. Clair County, IL reached a record high of 57.87 in January of 2009 and a record low of 46.27 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 St. Clair County, IL - last updated from the United States Federal Reserve on May of 2024.