Monticello ( ) is the only city in Jefferson County, Florida, United States. The population was 2,506 at the 2010 census. It is the county seat of Jefferson County. The city is named after Monticello, the estate of the county's namesake, Thomas Jefferson, on which the Jefferson County Courthouse (Monticello, Florida) was modeled. Monticello is home to Indian mounds and many historic buildings, including the Perkins Opera House and Monticello Old Jail Museum. Geography Monticello is located in northern Jefferson County at . U.S. Route 90 runs through the center of the city as Washington Street, leading east to Greenville and west to Tallahassee. U.S. Route 19 passes through the city center on Jefferson Street, leading south to Capps and north to Thomasville, Georgia. The two highways meet in the center of Monticello at Courthouse Circle, which surrounds the Jefferson County Courthouse. US-19 leads south from the courthouse to Interstate 10 at Exit 225. I-10 leads west to Tallahassee and east to Lake City. According to the United States Census Bureau, the city has a total area of , all land. Demographics 2020 census Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race. As of the census of 2000, there were 2,533 people, 973 households, and 664 families residing in the city. The population density was . There were 1,088 housing units at an average density of . The racial makeup of the city was 47.06% White, 50.85% African American, 0.12% Native American, 0.59% Asian, 0.08% Pacific Islander, 0.43% from other races, and 0.87% from two or more races. Hispanic or Latino of any race were 1.30% of the population. There were 973 households, out of which 29.3% had children under the age of 18 living with them, 41.3% were married couples living together, 23.5% had a female householder with no husband present, and 31.7% were non-families. 27.6% of all households were made up of individuals, and 11.5% had someone living alone who was 65 years of age or older. The average household size was 2.48 and the average family size was 3.03. In the city, the population was spread out, with 25.1% under the age of 18, 9.0% from 18 to 24, 24.6% from 25 to 44, 22.7% from 45 to 64, and 18.6% who were 65