Home Postcodes by state WA 6084 Postcode 6084 6084 is the postcode for 5 localities in WA: Avon Valley National Park, Bullsbrook, Chittering, Lower Chittering and Walyunga National Park. Localities with postcode 6084Avon Valley National ParkWABullsbrookWAChitteringWALower ChitteringWAWalyunga National ParkWA Postcode 6084 State or territory Western Australia (WA) Localities 5 Council area Swan; Chittering Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6083 · Postcode 6090