Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Mercer County, NJ was 73261.00000 Persons in January of 2022, according to the United States Federal Reserve. Historically, Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Mercer County, NJ reached a record high of 74456.00000 in January of 2021 and a record low of 69854.00000 in January of 2009. Trading Economics provides the current actual value, an historical data chart and related indicators for Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Mercer County, NJ - last updated from the United States Federal Reserve on May of 2024.