White to Non-White Racial Dissimilarity (5-year estimate) Index for Powell County, MT was 16.24% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Powell County, MT reached a record high of 18.13 in January of 2012 and a record low of 5.74 in January of 2017. 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 Powell County, MT - last updated from the United States Federal Reserve on May of 2024.