Home Postcodes by state NSW 2798 Postcode 2798 2798 is the postcode for 5 localities in NSW: Forest Reefs, Guyong, Millthorpe, Spring Terrace and Tallwood. Localities with postcode 2798Forest ReefsNSWGuyongNSWMillthorpeNSWSpring TerraceNSWTallwoodNSW Postcode 2798 State or territory New South Wales (NSW) Localities 5 Council area Blayney; Mainly Cabonne, partly Orange Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2797 · Postcode 2799