The Old Mississippi State Capitol, also known as Old Capitol Museum or Old State Capitol, is a building that is a Mississippi State Historic Site and was declared a National Historic Landmark in 1990.
It is located at 100 N. State St, on the east side of State Street at Capitol Street, in Jackson. It is operated as a museum by the state of Mississippi. The building dates from 1837, and was the Mississippi statehouse until 1903. Among the features is a rotunda dome 94 feet high.