White to Non-White Racial Dissimilarity (5-year estimate) Index for Harper County, OK was 4.31% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Harper County, OK reached a record high of 25.56 in January of 2016 and a record low of 1.67 in January of 2019. 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 Harper County, OK - last updated from the United States Federal Reserve on May of 2024.