White to Non-White Racial Dissimilarity (5-year estimate) Index for Mahaska County, IA was 22.91% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Mahaska County, IA reached a record high of 44.96 in January of 2014 and a record low of 16.97 in January of 2019. 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 Mahaska County, IA - last updated from the United States Federal Reserve on May of 2024.