Home Postcodes by state NSW 2265 Postcode 2265 2265 is the postcode for 2 localities in NSW: Cooranbong and Martinsville. Localities with postcode 2265CooranbongNSWMartinsvilleNSW Postcode 2265 State or territory New South Wales (NSW) Localities 2 Council area Lake Macquarie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2264 · Postcode 2267