Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Jefferson County, MO was 2277.00000 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 Jefferson County, MO reached a record high of 2353.00000 in January of 2009 and a record low of 1476.00000 in January of 2012. 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 Jefferson County, MO - last updated from the United States Federal Reserve on May of 2024.