Home Postcodes by state NSW 2018 Postcode 2018 2018 is the postcode for 2 localities in NSW: Eastlakes and Rosebery. Localities with postcode 2018EastlakesNSWRoseberyNSW Postcode 2018 State or territory New South Wales (NSW) Localities 2 Council area Bayside; Mainly Sydney, partly Bayside Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2017 · Postcode 2019