Home Postcode finder NSW Gostwyck Gostwyck postcode NSW Gostwyck is a locality in New South Wales covered by postcode 2358. Postcode 2358 State or territory New South Wales (NSW) Region NSW North Coast Add a free Gostwyck business listing Be the first listing in Gostwyck Common questionsWhat is the postcode for Gostwyck?Gostwyck, NSW has the postcode 2358.What state is Gostwyck in?Gostwyck is in New South Wales (NSW).Does postcode 2358 cover more than one suburb?Yes. Postcode 2358 covers 10 localities, so the postcode alone does not identify Gostwyck. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.