Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in San Mateo County, CA was 16015.00000 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 San Mateo County, CA reached a record high of 21434.00000 in January of 2009 and a record low of 16015.00000 in January of 2022. 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 San Mateo County, CA - last updated from the United States Federal Reserve on May of 2024.