Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Washington County, IL was 75.00000 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 Washington County, IL reached a record high of 146.00000 in January of 2014 and a record low of 75.00000 in January of 2017. 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 Washington County, IL - last updated from the United States Federal Reserve on May of 2024.