Jefferson County Courthouse, County courthouse in Monticello, United States.

The Jefferson County Courthouse is a Classical Revival building of 1909 by architect Edward Columbus Hosford, standing in the middle of a large traffic circle at the intersection of US 90 and US 19 in Monticello. Its design was modeled on Thomas Jefferson's house, Monticello, the plantation for which the town is named.

Built in 1909, the courthouse was designed by Georgia-born architect Edward Columbus Hosford and erected by the Mutual Construction Company of Louisville, Kentucky, whose bid was $39,412. It stands at the intersection of US 90 and US 19, in the middle of a large traffic circle. The building is a contributing property in the Monticello Historic District, listed on the National Register of Historic Places on August 19, 1977.

Over the doors of the courthouse is inscribed the motto Suum Cuique, Latin for "To each his own". The building was modeled on Thomas Jefferson's house, Monticello, the plantation for which the town is named. The courthouse is a contributing property in the Monticello Historic District, listed on the National Register of Historic Places on August 19, 1977.

The courthouse stands in the middle of a large traffic circle at the intersection of US 90 and US 19, so it is reached by crossing the surrounding roadway rather than from a sidewalk. It remains an active courthouse; visitors should keep to public areas and avoid disturbing proceedings.

The Latin motto Suum Cuique, meaning "To each his own," is carved over the courthouse doors. Some residents jokingly say it as "Sue 'em quick," turning the formal inscription into a local pun.