Home Postcodes by state WA 6318 Postcode 6318 6318 is the postcode for 4 localities in WA: Broomehill, Broomehill East, Broomehill Village and Broomehill West. Localities with postcode 6318BroomehillWABroomehill EastWABroomehill VillageWABroomehill WestWA Postcode 6318 State or territory Western Australia (WA) Localities 4 Council area Broomehill-Tambellup Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6317 · Postcode 6320