Founded January 20, 1827
County Seat: Monticello
597.74 sq. miles
Population (2010): 14,761
Median household income (2009): $38,193
» The original Native American settlers were Apalachees and Miccosukees (Creeks who became Seminoles).
» Jefferson County was named for Thomas Jefferson, third President of the United States of America, who served from 1801 to 1809.
» The first Europeans entered Jefferson county with Panfilo de Narvaez in 1528.
» Jefferson County is known as the Keystone County, because it is the only Florida County that borders both Georgia and the Gulf of Mexico.
» The Franciscans administered 5 missions in the county during the 17th century.