Home Postcode finder NSW Diamond Beach Diamond Beach postcode NSW Diamond Beach is a locality in New South Wales covered by postcode 2430. Postcode 2430 State or territory New South Wales (NSW) Region Hunter Add a free Diamond Beach business listing Be the first listing in Diamond Beach Common questionsWhat is the postcode for Diamond Beach?Diamond Beach, NSW has the postcode 2430.What state is Diamond Beach in?Diamond Beach is in New South Wales (NSW).Does postcode 2430 cover more than one suburb?Yes. Postcode 2430 covers 39 localities, so the postcode alone does not identify Diamond Beach. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.