what county is walnut il in
Description. Walnut Hill is a village in Marion County, Illinois, United States. The population was 109 at the 2000 census. Walnut Hill is located at 38Â°28â²39â³N 89Â°2â²44â³W / 38.4775Â°N 89.04556Â°W / 38.4775; -89.04556 (38.477541, -89.045513).