The Preservation Society of Newport County is a private, non-profit organization based in Newport, Rhode Island. It is Rhode Island's largest and most-visited cultural organization. The organization's mission is to preserve the architectural heritage of Newport County, Rhode Island, including those of the Bellevue Avenue Historic District. Its fourteen historic properties and landscapes—seven of which are National Historic Landmarks, and eleven of which are open to the public—form a complete essay of American historical development from the Colonial era through to the Gilded Age.
The Preservation Society of Newport County was founded in 1945 by a dedicated and concerned group of Newporters led by Katherine and George Warren to save Hunter House from demolition. For a brief time they were known as the Georgian Society until they changed their name to the Preservation Society of Newport County.
More information on the Wikipedia page  which has a list of properties administered by the Society.
The website is