Lolo is an unincorporated community and census-designated place (CDP) in Missoula County, Montana, United States. It is part of the Missoula metropolitan area. The population was 4,399 at the 2020 census, an increase from its population of 3,892 in 2010. It is home to Travelers' Rest State Park, a site where Lewis and Clark camped in 1805 and again in 1806.