White to Non-White Racial Dissimilarity (5-year estimate) Index for Fergus County, MT was 14.36% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Fergus County, MT reached a record high of 29.70 in January of 2020 and a record low of 2.14 in January of 2011. 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 Fergus County, MT - last updated from the United States Federal Reserve on May of 2024.