Home Postcodes by state NSW 2779 Postcode 2779 2779 is the postcode for Hazelbrook, NSW. Localities with postcode 2779HazelbrookNSW Postcode 2779 State or territory New South Wales (NSW) Localities 1 Council area Blue Mountains Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2778 · Postcode 2780