Vandalia is a city in Montgomery County, Ohio, United States, and a suburb of Dayton. Its population was 15,209 during the 2020 census. In addition to being the city closest to Dayton International Airport, Vandalia lies at the crossroads of I-75 and I-70.
Aerial view of Vandalia, with Dayton International Airport to the north
Montgomery County is in the southwestern part of the U.S. state of Ohio. At the 2020 census, the population was 537,309, making it the fifth-most populous county in Ohio. The county seat is Dayton. The county was named in honor of Richard Montgomery, an American Revolutionary War general, who was killed in 1775 while attempting to capture Quebec City, Canada. Montgomery County is part of the Dayton, Ohio, Metropolitan Statistical Area.
Current Montgomery County Courthouse
Downtown Dayton, the largest city in Montgomery County