St. Marie or Saint Marie is a census-designated place (CDP) in Valley County, Montana, United States. The population was 264 at the 2010 census. It is located at the site of the former Glasgow Air Force Base.
When the Air Force base was decommissioned, the on-base housing was purchased and offered for sale to private individuals. While many of the bids for the houses were from salvage companies, the community ultimately escaped demolition. Homes which had housed thousands of military personnel when the base was in operation were briefly promoted as condominiums for retirees.
Despite local efforts, most of the re-purposed housing units sit empty and abandoned. A few hundred residents remain in what is otherwise a partial ghost town. The runway remains in use as Glasgow Industrial Airport (FAA LID: 07MT), a test site for Boeing aircraft. The nearby city of Glasgow, Montana has dropped in population by half (from 6400 in the 1960s to 3250 in 2010) after the base closure.