Kirkwood is an unincorporated community located within Voorhees Township in Camden County, in the U.S. state of New Jersey. Kirkwood once had a post office assigned United States Postal Service ZIP Code 08043. The ZIP Code has been reassigned to a post office named Voorhees that serves the entire township. Kirkwood is still a valid cit…Kirkwood is an unincorporated community located within Voorhees Township in Camden County, in the U.S. state of New Jersey. Kirkwood once had a post office assigned United States Postal Service ZIP Code 08043. The ZIP Code has been reassigned to a post office named Voorhees that serves the entire township. Kirkwood is still a valid city name for mailing purposes.