Vandalia, Illinois, is a small city located in Fayette County. It serves as the county seat and has a rich history, having been the state capital of Illinois from 1819 to 1820. The city is known for its historic sites, including the Vandalia Statehouse, which is a preserved building from its time as the capital. The population of Vandalia is around 7,000 residents, making it a close-knit community. The city offers various recreational activities, including parks and sports facilities. Additionally, Vandalia is home to the Vandalia Lake, which provides opportunities for fishing and boating.