Home Postcodes by state NSW 2296 Postcode 2296 2296 is the postcode for Islington, NSW. Localities with postcode 2296IslingtonNSW Postcode 2296 State or territory New South Wales (NSW) Localities 1 Council area Newcastle Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2295 · Postcode 2297