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Vandalia is a city in and the county seat of Fayette County, Illinois, United States. At the 2020 Census, the population was 7,458. Vandalia is northeast of St. Louis, on the Kaskaskia River. It served as the state capital of Illinois from 1819 until 1839, when the seat of state government moved to the current capital of Springfield. Vandalia was for years the western terminus of the National Road. From 1836 onward, Vandalia is the home of the Vandalia State House State Historic Site. [edit] Research Tips
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