Lost Nation, Illinois is an unincorporated community and census-designated place (CDP) in Ogle County, Illinois, United States. It is located south of the city of Oregon. As of the 2020 census, Lost Nation had a population of 714. Lost Nation has an area of ; of this is land, and is water.
Lost Nation has a golf course called "Lost Nation Golf Course".
Most of it is in the Dixon Unit School District 170. A portion is in the Ashton Community Unit School District 275.