Home Postcodes by state NSW 2293 Postcode 2293 2293 is the postcode for 2 localities in NSW: Maryville and Wickham. Localities with postcode 2293MaryvilleNSWWickhamNSW Postcode 2293 State or territory New South Wales (NSW) Localities 2 Council area Newcastle Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2292 · Postcode 2294