Montana State Capitol Building The seat of the state's government, this 1902 copper-domed capitol building is listed on the National Register of Historic Places and is an example of Greek neoclassical architecture. The state legislature is in session January through April and guided or self-guided tours are available year round. Address: 1301 E. Sixth Ave. Helena MT USA 59620 Send an Email 1 406 444-4789
1 406 444-4789