White to Non-White Racial Dissimilarity (5-year estimate) Index for Gallatin County, MT was 31.75% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Gallatin County, MT reached a record high of 31.75 in January of 2022 and a record low of 18.96 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 Gallatin County, MT - last updated from the United States Federal Reserve on May of 2024.