White to Non-White Racial Dissimilarity (5-year estimate) Index for Big Horn County, MT was 18.58% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Big Horn County, MT reached a record high of 28.06 in January of 2017 and a record low of 8.71 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 Big Horn County, MT - last updated from the United States Federal Reserve on May of 2024.