Home Postcodes by state NSW 2146 Postcode 2146 2146 is the postcode for 3 localities in NSW: Old Toongabbie, Toongabbie and Toongabbie East. Localities with postcode 2146Old ToongabbieNSWToongabbieNSWToongabbie EastNSW Postcode 2146 State or territory New South Wales (NSW) Localities 3 Council area Parramatta; Mainly Parramatta, partly Blacktown Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2145 · Postcode 2147