Home Postcodes by state NSW 2227 Postcode 2227 2227 is the postcode for 2 localities in NSW: Gymea and Gymea Bay. Localities with postcode 2227GymeaNSWGymea BayNSW Postcode 2227 State or territory New South Wales (NSW) Localities 2 Council area Sutherland Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2226 · Postcode 2228