Resident Population in Gallatin County, IL was 4.69000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in Gallatin County, IL reached a record high of 7.85000 in January of 1981 and a record low of 4.69000 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Gallatin County, IL - last updated from the United States Federal Reserve on April of 2026.