Jefferson County is a county located in the U.S. state of Florida. As of the 2010 census, the population was 14,761. Its county seat is Monticello.Jefferson County is part of the Tallahassee, FL Metropolitan Statistical Area.HistoryJefferson County was created in 1827. It was named for Thomas Jefferson, third President of the United States of America, who had died the year before the county's establishment.Forts of Jefferson CountyFort Roger Jones, Aucilla, north of US 90.Fort Noel, south of Lamont on the Aucilla River, six miles northwest of Fort Pleasant in Taylor County. Also known as Fort Number Three .Camp Carter, near Waukeenah.Fort Welaunee, a settlers' fort on the Welaunee Plantation near Wacissa. Fort Gamble was later established here.Fort Aucilla, two miles south-east of Fort Gamble, southwest of Lamont, between the Aucilla and Wacissa Rivers. Also spelled Ocilla.Fort Wacissa, a settlers' fort located south of Wacissa on the Wacissa River, west of Cabbage Grove.GeographyAccording to the U.S. Census Bureau, the county has a total area of, of which is land and (6.0%) is water.Jefferson County is the only county in Florida which borders both the state of Georgia and the Gulf of Mexico
