Home Postcodes by state NSW 2122 Postcode 2122 2122 is the postcode for 2 localities in NSW: Eastwood and Marsfield. Localities with postcode 2122EastwoodNSWMarsfieldNSW Postcode 2122 State or territory New South Wales (NSW) Localities 2 Council area Mainly Ryde, partly Parramatta; Ryde Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2121 · Postcode 2125