Home Postcodes by state NSW 2321 Postcode 2321 2321 is the postcode for 20 localities in NSW: Berry Park, Butterwick, Clarence Town, Cliftleigh, Duckenfield, Duns Creek and 14 more. Localities with postcode 2321Berry ParkNSWButterwickNSWClarence TownNSWCliftleighNSWDuckenfieldNSWDuns CreekNSWGillieston HeightsNSWGlen MartinNSWGlen WilliamNSWHarpers HillNSWHeddon GretaNSWHintonNSWLochinvarNSWLuskintyreNSWMorpethNSWOswaldNSWPhoenix ParkNSWRaworthNSWWindermereNSWWoodvilleNSW Postcode 2321 State or territory New South Wales (NSW) Localities 20 Council area Maitland; Port Stephens; Dungog; Cessnock Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2320 · Postcode 2322