Home Postcodes by state NSW 2225 Postcode 2225 2225 is the postcode for Oyster Bay, NSW. Localities with postcode 2225Oyster BayNSW Postcode 2225 State or territory New South Wales (NSW) Localities 1 Council area Sutherland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2224 · Postcode 2226