Home Postcodes by state NSW 2231 Postcode 2231 2231 is the postcode for Kurnell, NSW. Localities with postcode 2231KurnellNSW Postcode 2231 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 2230 · Postcode 2232