White to Non-White Racial Dissimilarity (5-year estimate) Index for Umatilla County, OR was 39.57% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Umatilla County, OR reached a record high of 39.57 in January of 2022 and a record low of 30.78 in January of 2009. 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 Umatilla County, OR - last updated from the United States Federal Reserve on May of 2024.