Franklin Park is an unincorporated area within portions of North Brunswick Township and South Brunswick Township in Middlesex County and Franklin Township in Somerset County, in New Jersey, United States. Route 27 (historically known as Old Road/King's Highway and once part of the Lincoln Highway system) bisects the village and serves as the dividing line between the two counties. 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. As of the United States Census, 2000, the population for ZIP Code Tabulation Area (ZCTA) 08823 was 7,389.