Lolo is a census-designated place (CDP) in Missoula County, Montana, United States. It is part of the 'Missoula, Montana Metropolitan Statistical Area'. The population was 3,388 at the 2000 census. It is home to Travelers' Rest State Park, a site where Lewis and Clark camped in 1805 and again in 1806. It is one of the only sites in the nation with physical conformation of their visit.