Home Postcodes by state NSW 2323 Postcode 2323 2323 is the postcode for 14 localities in NSW: Ashtonfield, Brunkerville, Buchanan, Buttai, East Maitland, Four Mile Creek and 8 more. Localities with postcode 2323AshtonfieldNSWBrunkervilleNSWBuchananNSWButtaiNSWEast MaitlandNSWFour Mile CreekNSWFreemans WaterholeNSWGreen HillsNSWMetfordNSWMount VincentNSWMulbringNSWPitnacreeNSWRichmond ValeNSWTenambitNSW Postcode 2323 State or territory New South Wales (NSW) Localities 14 Council area Maitland; Cessnock; Lake Macquarie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2322 · Postcode 2324