Liberty is a village in Adams County, Illinois, United States. The population was 519 at the 2000 census. It is part of the Quincy, IL–MO Micropolitan Statistical Area.
Liberty is located at 39°52′48″N 91°6′29″W / 39.88°N 91.10806°W / 39.88; -91.10806 (39.879948, -91.108137).
According to the United States Census Bureau, the village has a total area of 0.4 square miles (1.0 km²), all of it land.