Named after Thomas Jefferson, third President of the United States (1801-1809) and author of the Declaration of Independence.
Established: March 26, 1819
County Seat: Mount Vernon
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Subcategories 13
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Online resource for Jefferson County family historians.
News and information about Democratic candidates, elected officials and events for the county, its townships and Illinois.
Online resource for Jefferson County family historians.
News and information about Democratic candidates, elected officials and events for the county, its townships and Illinois.
