The Montana Chamber of Commerce was founded as Montanans, Inc. in 1931 to promote business and professional interests and industrial development. The name was changed in 1946. Records (1931-1967) include general correspondence, financial records, legal documents, minutes, news releases, organizational records, printed materials, reports, speeches, subject files, and miscellany.

These Montana Constitutional Convention records (1971-1972) consist of correspondence, minutes and proceedings, delegate proposals, reports, resolutions, subject files, writings, and news releases. Artifacts, photographs, and printed material have been transferred to the Museum, Photograph Archives, and Library respectively. Reel-to-reel tapes were deaccessioned and destroyed.