Lewistown is a city in and the county seat of Fergus County, Montana, United States. The population was 5,813 at the 2000 census. Lewistown is located in central Montana, the geographic center of the state, southeast of Great Falls. First planned in 1882, it was the site of an 1880s gold rush.
Lewistown is located at 47°3′53″N 109°25′48″W / 47.06472°N 109.43°W / 47.06472; -109.43 (47.064615, -109.429882).
According to the United States Census Bureau, the city has a total area of 1.9 square miles (4.9 km²), all of it land.