White to Non-White Racial Dissimilarity (5-year estimate) Index for McHenry County, IL was 23.23% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for McHenry County, IL reached a record high of 26.33 in January of 2013 and a record low of 22.52 in January of 2010. 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 McHenry County, IL - last updated from the United States Federal Reserve on May of 2024.