Home Postcodes by state NSW 2334 Postcode 2334 2334 is the postcode for Greta, NSW. Localities with postcode 2334GretaNSW Postcode 2334 State or territory New South Wales (NSW) Localities 1 Council area Cessnock Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2333 · Postcode 2335