White to Non-White Racial Dissimilarity (5-year estimate) Index for Northumberland County, VA was 20.70% 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, VA reached a record high of 27.95 in January of 2020 and a record low of 9.05 in January of 2018. 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, VA - last updated from the United States Federal Reserve on May of 2024.