The Haddam Center Historic District is a 267acre historic district encompassing the institutional and residential center of the town of Haddam, Connecticut that was listed on the National Register of Historic Places in 1989 as a result of efforts by the Haddam Historical Society.It includes the James Hazelton House, at 23 Hayden Hill Rd., which is separately NRHP-listed, as well as the Brainerd Memorial Library. The district includes examples of Colonial, Greek Revival and Federal architecture. At the time of listing, the district included 120 contributing buildings, four contributing sites, and 45 other non-contributing buildings.
