Home Postcodes by state NSW 2431 Postcode 2431 2431 is the postcode for 3 localities in NSW: Arakoon, Jerseyville and South West Rocks. Localities with postcode 2431ArakoonNSWJerseyvilleNSWSouth West RocksNSW Postcode 2431 State or territory New South Wales (NSW) Localities 3 Council area Kempsey Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2430 · Postcode 2439