Home Postcodes by state NSW 2345 Postcode 2345 2345 is the postcode for 2 localities in NSW: Attunga and Garthowen. Localities with postcode 2345AttungaNSWGarthowenNSW Postcode 2345 State or territory New South Wales (NSW) Localities 2 Council area Tamworth Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2344 · Postcode 2346