Home Postcodes by state NSW 2084 Postcode 2084 2084 is the postcode for 3 localities in NSW: Cottage Point, Duffys Forest and Terrey Hills. Localities with postcode 2084Cottage PointNSWDuffys ForestNSWTerrey HillsNSW Postcode 2084 State or territory New South Wales (NSW) Localities 3 Council area Northern Beaches Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2083 · Postcode 2085