Vandalia is a city in Montgomery County, Ohio, United States, and a suburb of Dayton. Its population was 14,603 during the 2000 census. The James M. Cox Dayton International Airport is located in the city. Vandalia is a sister city to Lichtenfels, Germany and Prestwick, Scotland. It is part of the Dayton Metropolitan Statistical Area. The city of Vandalia is home to the Dayton International Airport and the crossroads of I-75 and I-70, making it a major hub for business. The city is mostly upper middle class, and residents enjoy low taxes with excellent schools, easy traffic, a booming restaurant scene, one of Ohio's top rated Police task forces, and some of the best parks in the Miami Valley.