As part of it's mission to represent the history of Sag Harbor to the public, the Society holds:
Over 500 books, letters, documents, diaries, postcards, bibles
Ledgers that record the history of the village
A photograph collection that includes images of local residents, buildings, and sites within and surrounding the village.
An extensive collection of artwork done by Annie Cooper Boyd, the former owner of the Society's headquarters, of local sites and scenes.
The majority of the collection is stored at the Society's headquarters, and may be viewed by appointment. Reference questions relating to the history of the village can be answered by the staff as well.