Resident Population in Boone County, IL was 53.20200 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Boone County, IL reached a record high of 54.12300 in January of 2011 and a record low of 25.44000 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Boone County, IL - last updated from the United States Federal Reserve on May of 2024.