Bordentown is a city in Burlington County, New Jersey, United States. As of the 2010 United States Census, the city's population was 3,924. The population declined by 45 from the 3,969 counted in the 2000 U.S. Census, which had in turn declined by 372 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. Bordentown is 5.8 miles southeast from Trenton and 25.3 miles northeast of Philadelphia.Bordentown was originally incorporated as a borough by an act of the New Jersey Legislature on December 9, 1825, from portions within Chesterfield Township. It was reincorporated as a city on April 3, 1867, and separated from Chesterfield Township c. 1877.