White to Non-White Racial Dissimilarity (5-year estimate) Index for Jefferson County, IA was 32.21% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Jefferson County, IA reached a record high of 50.06 in January of 2009 and a record low of 18.60 in January of 2015. 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 Jefferson County, IA - last updated from the United States Federal Reserve on May of 2024.