Resident Population in Hamilton County, IL was 7.91100 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Hamilton County, IL reached a record high of 9.40000 in January of 1979 and a record low of 7.91100 in January of 2023. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Hamilton County, IL - last updated from the United States Federal Reserve on May of 2024.