Home Postcodes by state NSW 2783 Postcode 2783 2783 is the postcode for Lawson, NSW. Localities with postcode 2783LawsonNSW Postcode 2783 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 2782 · Postcode 2784