White to Non-White Racial Dissimilarity (5-year estimate) Index for Tillman County, OK was 14.47% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Tillman County, OK reached a record high of 25.40 in January of 2012 and a record low of 13.36 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 Tillman County, OK - last updated from the United States Federal Reserve on May of 2024.