Home Postcodes by state NSW 2738 Postcode 2738 2738 is the postcode for 5 localities in NSW: Gol Gol, Mallee, Monak, Paringi and Trentham Cliffs. Localities with postcode 2738Gol GolNSWMalleeNSWMonakNSWParingiNSWTrentham CliffsNSW Postcode 2738 State or territory New South Wales (NSW) Localities 5 Council area Wentworth Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2737 · Postcode 2739