Rancocas is an unincorporated community located within Westampton Township in Burlington County, New Jersey. The name derives from the Native American word Rankokous, which was used in the name of the Powhatan Lenape Nation Indian Reservation located in Westampton Township. The name was also known as a sub-tribe of the Ancocus. The Reservation was a popular tourist destination for visitors from the Philadelphia area, New York, and local residents, before the Reservation became Rancocas State Park.

Westampton is a township in Burlington County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 9,121, an increase of 308 (+3.5%) from the 2010 census count of 8,813, which in turn reflected an increase of 1,596 (+22.1%) from the 7,217 counted in the 2000 census. The township, and all of Burlington County, is a part of the Philadelphia-Reading-Camden combined statistical area and the Delaware Valley.