White to Non-White Racial Dissimilarity (5-year estimate) Index for Northumberland County, PA was 42.80% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Northumberland County, PA reached a record high of 56.68 in January of 2011 and a record low of 40.76 in January of 2021. 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 Northumberland County, PA - last updated from the United States Federal Reserve on May of 2024.