Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Stephenson County, IL was 3861.00000 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 Stephenson County, IL reached a record high of 4469.00000 in January of 2018 and a record low of 3818.00000 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 Stephenson County, IL - last updated from the United States Federal Reserve on June of 2024.