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 Belle Rive@ (2) Ina@ (2) Mount Vernon@ (33) Nason@ (2) Opdyke@ (2) Scheller@ (3) Shiloh@ (3) Woodlawn@ (1) 1. Jefferson County Data - Data from the US Department of Congress, Bureau of the Census. 2. ILGenWeb - Jefferson County - Online resource for Jefferson County family historians.

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