Lolo is a census-designated place (CDP) in Missoula County, Montana, United States. It is part of the Missoula Metropolitan Statistical Area. The population was 3,892 at the 2010 census, an increase from its population of 3,388 in 2000. It is home to Travelers' Rest State Park, a site where Lewis and Clark camped in 1805 and again in 1806.
Lolo is at 46°45′55″N 114°5′9″W (46.765210, -114.085892). The town lies at the intersection of U.S. Routes 12 and 93, and at the eastern end of the Lolo Trail. It also sits at the confluence of Lolo Creek and the Bitterroot River.
According to the United States Census Bureau, the CDP has a total area of 9.7 square miles (25 km2), of which 9.5 square miles (25 km2) is land and 0.2 square miles (0.52 km2) (2.16 percent) is water.
As of the census of 2010, there were 3,892 people, 1,218 households, and 936 families residing in the CDP. The population density was 356.2 people per square mile (137.6/km2). There were 1,263 housing units at an average density of 132.8 per square mile (51.3/km2).