Home Postcodes by state NSW 2218 Postcode 2218 2218 is the postcode for 2 localities in NSW: Allawah and Carlton. Localities with postcode 2218AllawahNSWCarltonNSW Postcode 2218 State or territory New South Wales (NSW) Localities 2 Council area Georges River; Mainly Georges River, partly Bayside Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2217 · Postcode 2219