White to Non-White Racial Dissimilarity (5-year estimate) Index for McClain County, OK was 17.42% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for McClain County, OK reached a record high of 32.69 in January of 2009 and a record low of 17.42 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 McClain County, OK - last updated from the United States Federal Reserve on May of 2024.