White to Non-White Racial Dissimilarity (5-year estimate) Index for Clark County, IL was 23.43% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Clark County, IL reached a record high of 30.18 in January of 2021 and a record low of 7.22 in January of 2020. 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 Clark County, IL - last updated from the United States Federal Reserve on May of 2024.