Home Postcodes by state NSW 2785 Postcode 2785 2785 is the postcode for 2 localities in NSW: Blackheath and Megalong. Localities with postcode 2785BlackheathNSWMegalongNSW Postcode 2785 State or territory New South Wales (NSW) Localities 2 Council area Blue Mountains Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2784 · Postcode 2786