Port Mercer, New Jersey

Port Mercer is an unincorporated community located where the municipal boundaries of Lawrence Township, Princeton and West Windsor Township intersect in Mercer County, in the U.S. state of New Jersey. It is the location of the historic Port Mercer Canal House along the Delaware and Raritan Canal.

Port mercer developed starting in the 1830s with the construction of the Delaware & Raritan Canal. It represents one of West Windsor's historic hamlets, and several mid-1800s residences still populate the community. The hamlet thrived from the 1830s until the mid-late 1800s, when the current Northeast Corridor rail line relocated from next to the canal to its current position.

In October 2019, the Historical Society of West Windsor published an online museum exploring the history of West Windsor - including Port Mercer.