Home Postcode finder NSW Hardys Bay Hardys Bay postcode NSW Hardys Bay 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 Hardys Bay business listing Be the first listing in Hardys Bay Common questionsWhat is the postcode for Hardys Bay?Hardys Bay, NSW has the postcode 2257.What state is Hardys Bay in?Hardys Bay 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 Hardys Bay. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.