Home Postcode finder NSW Wallarah Wallarah postcode NSW Wallarah is a locality in New South Wales covered by postcode 2259. Postcode 2259 State or territory New South Wales (NSW) Region Gosford Add a free Wallarah business listing Be the first listing in Wallarah Common questionsWhat is the postcode for Wallarah?Wallarah, NSW has the postcode 2259.What state is Wallarah in?Wallarah is in New South Wales (NSW).Does postcode 2259 cover more than one suburb?Yes. Postcode 2259 covers 42 localities, so the postcode alone does not identify Wallarah. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.