White to Non-White Racial Dissimilarity (5-year estimate) Index for Callahan County, TX was 18.25% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Callahan County, TX reached a record high of 18.25 in January of 2022 and a record low of 3.18 in January of 2013. 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 Callahan County, TX - last updated from the United States Federal Reserve on May of 2024.