Bordentown City is in Burlington County, New Jersey, United States. As of the United States 2000 Census, the city population was 3,969; which had fallen to 3,953 as of the 2006 census estimate. 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 City 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.