Vandalia is a city located in Montgomery County, Ohio. It is situated in the southwestern part of the state and is part of the Dayton Metropolitan Area. The city covers an area of about 13 square miles and has a population of around 15,000 people.

​Vandalia is known for its historic sites, parks, and recreational opportunities. Some of the popular attractions in Vandalia include the Dayton International Airport, the Vandalia Recreation Center, and the Dayton Aviation Heritage National Historical Park. The city is also home to a variety of businesses, restaurants, and shopping destinations.