Lake Mary Ronan, Montana

Lake Mary Ronan is a census-designated place (CDP) in Lake County, Montana, United States. The population was 65 at the 2010 census. The CDP is in northwestern Lake County, along the northern and eastern shores of Lake Mary Ronan, and includes the populated places of Lake Mary Ronan, Melton, and Sipes, as well as Lake Mary Ronan State Park. It is 8 mi northwest of U.S. Route 93 at Dayton, and 30 mi northwest of Polson, the Lake county seat.

According to the U.S. Census Bureau, the CDP has an area of 2.7 sqkm, of which 1796 sqm, or 0.07%, are water.