White to Non-White Racial Dissimilarity (5-year estimate) Index for Yellowstone County, MT was 25.74% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Yellowstone County, MT reached a record high of 31.95 in January of 2020 and a record low of 19.49 in January of 2014. 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 Yellowstone County, MT - last updated from the United States Federal Reserve on May of 2024.