The Assumption Parish Courthouse was built in 1896, while the nearby jail is an earlier building that was in place by at least 1885. The late 19th and early 20th centuries were a time of revival styles in architecture, recalling Greek, Roman, and Romanesque styles of earlier periods. The Assumption Parish Courthouse and Jail stand as the singular examples of Italianate architecture in the parish. The land on which the buildings now stand, along the West Bank of Bayou Lafourche, was donated by Maxill and Caroline Bourg in 1818, to serve as the permanent location for the courthouse. It was at this time that Napoleonville (today, with a population of 802) became the county seat. An earlier courthouse probably stood here, and some of its decorative features may be those that appear in the present courthouse, such as the earlier Federal and Greek Revival style mantels.