Records of the Governors of Montana consist of legislative files (1893-1935), including correspondence, bills, vetos, governors messages, petitions, etc.; general correspondence (1902-1962) for individual administrations; and subject files (1889-1962) arranged by state agency and topic.

This collection consists of records of the Montana State Prison (1869-1974), the Board of Pardons (1890-1965), the Board of Prison Commissioners (1890-1962), and the United States Penitentiary, Montana Territory, including materials such as prisoner description sheets, prisoner receipt and discharge registers, minutes, etc.