Jefferson County Montana (Vacant / Not In Use) has 2 places on the National Register of Historic Places including 2 places of Statewide significance. Significant places include Fraternity Hall and Montana Deaf and Dumb Asylum.
Some of the country's most noteable architects helped create the Jefferson County places including John Suite and John C. Paulsen. Prominent architectural styles found in Jefferson Country are Greek Revival, Italianate and Renaissance.