White to Non-White Racial Dissimilarity (5-year estimate) Index for Dewey County, OK was 4.78% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Dewey County, OK reached a record high of 27.41 in January of 2012 and a record low of 4.78 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 Dewey County, OK - last updated from the United States Federal Reserve on May of 2024.