Montville is an unincorporated community in central Montville Township, Geauga County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 44064. It lies at the intersection of U.S. Route 6 with State Route 528.A post office called Montville has been in operation since 1825. The area of Montville was named for its lofty elevation.