The Haddam Historical Society operates the Thankful Arnold House Museum, which is a house that has been kept to preserve its turn-of-the-19th-century design. Visitors view the home of prioprietor and widow Thankful Arnold, and a tour is a walk through three generations of this matriarchal family.
Haddam Public Health promotes healthy families and individuals by partnering with other health and social agencies region-wide, offering guidance, working on the prevention of disease, and coordinating town-funded health care. The location, in a separate building from town hall, offers residents a confidential atmosphere where they can talk about their health and related issues in a private manner.