Home Postcodes by state NSW 2286 Postcode 2286 2286 is the postcode for 3 localities in NSW: Holmesville, Seahampton and West Wallsend. Localities with postcode 2286HolmesvilleNSWSeahamptonNSWWest WallsendNSW Postcode 2286 State or territory New South Wales (NSW) Localities 3 Council area Lake Macquarie Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 2285 · Postcode 2287