Home Postcodes by state NSW 2773 Postcode 2773 2773 is the postcode for 2 localities in NSW: Glenbrook and Lapstone. Localities with postcode 2773GlenbrookNSWLapstoneNSW Postcode 2773 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 2770 · Postcode 2774