Home Postcodes by state NSW 2121 Postcode 2121 2121 is the postcode for 2 localities in NSW: Epping and North Epping. Localities with postcode 2121EppingNSWNorth EppingNSW Postcode 2121 State or territory New South Wales (NSW) Localities 2 Council area Parramatta; Hornsby Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2120 · Postcode 2122