Population Estimate, Total, Not Hispanic or Latino, Black or African American Alone (5-year estimate) in Winnebago County, IL was 36916.00000 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 Winnebago County, IL reached a record high of 36916.00000 in January of 2022 and a record low of 33259.00000 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 Winnebago County, IL - last updated from the United States Federal Reserve on May of 2024.