 The population declined by 45 (-1.1%) from the 3,969 counted in the 2000 U.S. Census, which had in turn declined by 372 (-8.6%) from the 4,341 counted in the 1990 Census.Bordentown is located at the confluence of the Delaware River, Blacks Creek and Crosswicks Creek.The latter is the border between Burlington and Mercer Counties.