Home Postcodes by state NSW 2311 Postcode 2311 2311 is the postcode for 11 localities in NSW: Allynbrook, Bingleburra, Carrabolla, East Gresford, Eccleston, Gresford and 5 more. Localities with postcode 2311AllynbrookNSWBingleburraNSWCarrabollaNSWEast GresfordNSWEcclestonNSWGresfordNSWHaltonNSWLewinsbrookNSWLostockNSWMount RiversNSWUpper AllynNSW Postcode 2311 State or territory New South Wales (NSW) Localities 11 Council area Dungog Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2309 · Postcode 2312