White to Non-White Racial Dissimilarity (5-year estimate) Index for Portage County, WI was 21.50% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Portage County, WI reached a record high of 27.07 in January of 2020 and a record low of 18.96 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 Portage County, WI - last updated from the United States Federal Reserve on May of 2024.