Mount Vernon, Illinois
City: Mount Vernon
Lat/Long: 38.3167, -88.9000
In 1819, commissioners appointed for the purpose chose a location for the county seat of Jefferson County, and the county commissioners' court named the new town Mt. Vernon. After 1848, Mt. Vernon was home to the Illinois Supreme Court.
William Henry Perrin, ed., History of Jefferson County, Illinois (Chicago: Globe, 1883), 136, 154, 281-83, 300-309.