Home Postcodes by state WA 6156 Postcode 6156 6156 is the postcode for 4 localities in WA: Attadale, Melville, Willagee and Willagee Central. Localities with postcode 6156AttadaleWAMelvilleWAWillageeWAWillagee CentralWA Postcode 6156 State or territory Western Australia (WA) Localities 4 Council area Melville Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6155 · Postcode 6157