Home Postcodes by state NSW 2128 Postcode 2128 2128 is the postcode for Silverwater, NSW. Localities with postcode 2128SilverwaterNSW Postcode 2128 State or territory New South Wales (NSW) Localities 1 Council area Parramatta Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2127 · Postcode 2130