White to Non-White Racial Dissimilarity (5-year estimate) Index for Merrimack County, NH was 37.03% in January of 2022, according to the United States Federal Reserve. Historically, White to Non-White Racial Dissimilarity (5-year estimate) Index for Merrimack County, NH reached a record high of 37.50 in January of 2021 and a record low of 30.00 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 Merrimack County, NH - last updated from the United States Federal Reserve on May of 2024.