Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in St. Clair County, MO was 51.00000 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 St. Clair County, MO reached a record high of 115.00000 in January of 2015 and a record low of 4.00000 in January of 2010. 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 St. Clair County, MO - last updated from the United States Federal Reserve on May of 2024.