Monticello is a city in Jefferson County, Florida, United States. The population was 2,533 at the 2000 census. As of 2004, the population recorded by the U.S. Census Bureau is 2,572. It is the county seat of Jefferson County. The city is named after Monticello, the estate of the county's namesake, Thomas Jefferson.
Monticello is located at 30°32′41″N 83°52′02″W / 30.544612°N 83.867321°W / 30.544612; -83.867321.
According to the United States Census Bureau, the city has a total area of 3.4 square miles (8.8 km²), all of it land. This is also where the highest confirmed recorded temperature in Florida occurred, at 109°F.