Frenchtown is a borough in Hunterdon County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 1,373, reflecting a decline of 115 from the 1,488 counted in the 2000 Census, which had in turn declined by 40 from the 1,528 counted in the 1990 Census.Frenchtown is located along the banks of the Delaware River on the Hunterdon Plateau. Various names have been applied to this settlement, after the many ferry operators residing on both sides of the river. The community had variously been known as Alexandria Ville, Sunbeam and Frenchtown over the years. The Borough was formed by an act of the New Jersey Legislature on April 4, 1867, from portions of Alexandria Township. Additional territory was acquired from Kingwood Township in 1876.The first bridge across the Delaware at Frenchtown was a six-span covered wooden bridge built in 1841 on the five piers that still stand today, and the community became a gateway to Pennsylvania.