Franklin Park is an unincorporated community and census-designated place located within Franklin Township, in Somerset County, New Jersey, United States. As of the 2010 United States Census, the CDP's population was 13,295. Route 27 bisects the village and serves as the dividing line between the two counties. The adjacent sections of South Brunswick and North Brunswick, Middlesex County on the east side of Route 27 are also known as Franklin Park, but are not included within the CDP's boundaries.The area is served as United States Postal Service ZIP code 08823. Most of the 2001 anthrax attacks letters had the address of Franklin Park.