The Society collects, preserves and shares the history and heritage of Guilford, CT, for present and future generations. The Society also maintains and operates the Thomas Griswold House Museum, which includes a c. 1774 New England saltbox house, an early blacksmith shop, a large barn filled with farm implements, two corn cribs, and a Victorian three-seat privy or outhouse. It further operates the Medad Stone Tavern, built in 1803 by Medad Stone.

The society offers research library access, classes, tours, and educational and recreational events; the buildings offer exhibits.