Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Williamson County, IL was 2204.00000 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 Williamson County, IL reached a record high of 2797.00000 in January of 2016 and a record low of 2106.00000 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 Williamson County, IL - last updated from the United States Federal Reserve on May of 2024.