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Vandalia is a city in Fayette
County, Illinois, United
States, 69 miles (111 km)
northeast of St. Louis, on
the Kaskaskia River. From
1819 to 1839 it served as
the state capital of Illinois.
Vandalia was for years the
western terminus of the
National Road.

Today it is the county seat
of Fayette County[1] and
the home of the Vandalia
State House State Historic
Site (1836). The population
was 6,975 at the 2000