Home Postcodes by state NSW 2144 Postcode 2144 2144 is the postcode for Auburn, NSW. Localities with postcode 2144AuburnNSW Postcode 2144 State or territory New South Wales (NSW) Localities 1 Council area Cumberland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2143 · Postcode 2145