Kendall Park is an unincorporated community and census-designated place in South Brunswick Township, Middlesex County, New Jersey, United States. As of the 2020 census, the CDP's population was 9,989, up from 9,339 in 2010. Kendall Park has a post office with its own ZIP Code that encompasses the majority of the CDP, as well as some surround…Kendall Park is an unincorporated community and census-designated place in South Brunswick Township, Middlesex County, New Jersey, United States. As of the 2020 census, the CDP's population was 9,989, up from 9,339 in 2010. Kendall Park has a post office with its own ZIP Code that encompasses the majority of the CDP, as well as some surrounding areas.