Home Postcode finder NSW Melville Melville postcode NSW Melville is a locality in New South Wales covered by postcode 2320. Postcode 2320 State or territory New South Wales (NSW) Region Hunter Add a free Melville business listing Be the first listing in Melville Common questionsWhat is the postcode for Melville?Melville, NSW has the postcode 2320.What state is Melville in?Melville is in New South Wales (NSW).Does postcode 2320 cover more than one suburb?Yes. Postcode 2320 covers 30 localities, so the postcode alone does not identify Melville. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.