Home Postcodes by state WA 6418 Postcode 6418 6418 is the postcode for Bruce Rock, WA. Localities with postcode 6418Bruce RockWA Postcode 6418 State or territory Western Australia (WA) Localities 1 Council area Bruce Rock Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6415 · Postcode 6419