Home Postcode finder NSW Old Erowal Bay Old Erowal Bay postcode NSW Old Erowal Bay is a locality in New South Wales covered by postcode 2540. Postcode 2540 State or territory New South Wales (NSW) Region NSW Country West Add a free Old Erowal Bay business listing Be the first listing in Old Erowal Bay Common questionsWhat is the postcode for Old Erowal Bay?Old Erowal Bay, NSW has the postcode 2540.What state is Old Erowal Bay in?Old Erowal Bay is in New South Wales (NSW).Does postcode 2540 cover more than one suburb?Yes. Postcode 2540 covers 68 localities, so the postcode alone does not identify Old Erowal Bay. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.