Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Union County, SD was 71.00000 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 Union County, SD reached a record high of 128.00000 in January of 2018 and a record low of 47.00000 in January of 2015. 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 Union County, SD - last updated from the United States Federal Reserve on May of 2024.