Vandalia is a city in Montgomery County, Ohio, United States, and a suburb of Dayton. Its population was 15,246 during the 2010 census. The James M. Cox Dayton International Airport is located in the city. In addition to being the home of the Dayton International Airport, Vandalia lies at the crossroads of I-75 and I-70, making it a major hub for business.
Vandalia is a sister city to Lichtenfels, Germany and Prestwick, Scotland. It is part of the Dayton Metropolitan Statistical Area.
Vandalia is about 10 miles (16 km) north of Dayton on Dixie Drive (former U.S. Highway 25). It is between the Great Miami River and the Stillwater River. The city has been called the "Crossroads of America" due to its location on the National Road and the Dixie Highway. These correspond to U.S. Route 40 and the decommissioned U.S. Route 25, which in turn, have been supplanted by two major expressways: east-west Interstate 70 and north-south Interstate 75.