Home Postcodes by state NSW 2300 Postcode 2300 2300 is the postcode for 5 localities in NSW: Bar Beach, Cooks Hill, Newcastle, Newcastle East and The Hill. Localities with postcode 2300Bar BeachNSWCooks HillNSWNewcastleNSWNewcastle EastNSWThe HillNSW Postcode 2300 State or territory New South Wales (NSW) Localities 5 Council area Newcastle Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2299 · Postcode 2302