White to Non-White Racial Dissimilarity (5-year estimate) Index for Ionia County, MI was 34.78% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Ionia County, MI reached a record high of 48.25 in January of 2009 and a record low of 33.66 in January of 2017. 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 Ionia County, MI - last updated from the United States Federal Reserve on May of 2024.