Home Postcode finder NSW Box Head Box Head postcode NSW Box Head is a locality in New South Wales covered by postcode 2257. Postcode 2257 State or territory New South Wales (NSW) Region Gosford Add a free Box Head business listing Be the first listing in Box Head Common questionsWhat is the postcode for Box Head?Box Head, NSW has the postcode 2257.What state is Box Head in?Box Head is in New South Wales (NSW).Does postcode 2257 cover more than one suburb?Yes. Postcode 2257 covers 12 localities, so the postcode alone does not identify Box Head. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.