The current Mason County courthouse, built in 1882–1883, is a functionalist
Federal style concrete building faced in buff-colored brick. The current Mason County courthouse is the result of two separate county seat moves, in which the political focus of the county moved from the
Illinois River port of Havana to the alternate location of
Bath, Illinois, and then back again to Havana. After the status of Havana was finalized in 1851, the taxpayers built a courthouse on the current site. After its destruction by fire, the 1851 site was re-used in 1882–1883 as the footprint of the current courthouse structure. A major remodeling and expansion project took place in 1960–1961. ==References==