White to Non-White Racial Dissimilarity (5-year estimate) Index for Winnebago County, IL was 40.84% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Winnebago County, IL reached a record high of 47.17 in January of 2017 and a record low of 40.84 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 Winnebago County, IL - last updated from the United States Federal Reserve on May of 2024.