Home Postcodes by state NSW 2104 Postcode 2104 2104 is the postcode for Bayview, NSW. Localities with postcode 2104BayviewNSW Postcode 2104 State or territory New South Wales (NSW) Localities 1 Council area Northern Beaches Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2103 · Postcode 2105