Home Postcodes by state NSW 2777 Postcode 2777 2777 is the postcode for 6 localities in NSW: Hawkesbury Heights, Springwood, Sun Valley, Valley Heights, Winmalee and Yellow Rock. Localities with postcode 2777Hawkesbury HeightsNSWSpringwoodNSWSun ValleyNSWValley HeightsNSWWinmaleeNSWYellow RockNSW Postcode 2777 State or territory New South Wales (NSW) Localities 6 Council area Blue Mountains Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2776 · Postcode 2778