Monticello is the only city and the county seat of Jefferson County, Florida, United States. The city is named after Monticello, the estate of the county's namesake, Thomas Jefferson, on which the Jefferson County Courthouse was modeled. The population was 2,589 at the 2020 census, up from 2,506 at the 2010 census. It is part of the Tallahassee, Florida Metropolitan Statistical Area.

Jefferson County is a county located in the Big Bend region in the northern part of the U.S. state of Florida. As of the 2020 census, the population was 14,510. Its county seat is Monticello.