Home Postcodes by state NSW 2173 Postcode 2173 2173 is the postcode for 2 localities in NSW: Holsworthy and Wattle Grove. Localities with postcode 2173HolsworthyNSWWattle GroveNSW Postcode 2173 State or territory New South Wales (NSW) Localities 2 Council area Liverpool Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2172 · Postcode 2174