Home Postcodes by state NSW 2329 Postcode 2329 2329 is the postcode for 3 localities in NSW: Cassilis, Merriwa and Uarbry. Localities with postcode 2329CassilisNSWMerriwaNSWUarbryNSW Postcode 2329 State or territory New South Wales (NSW) Localities 3 Council area Upper Hunter; Warrumbungle Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2328 · Postcode 2330