Resident Population in Hancock County, IL was 17.18600 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Hancock County, IL reached a record high of 24.20000 in January of 1981 and a record low of 17.18600 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Hancock County, IL - last updated from the United States Federal Reserve on May of 2024.