Home Postcodes by state WA 6394 Postcode 6394 6394 is the postcode for 8 localities in WA: Beaufort River, Boilup, Boscabel, Changerup, Mokup, Muradup and 2 more. Localities with postcode 6394Beaufort RiverWABoilupWABoscabelWAChangerupWAMokupWAMuradupWAOrchid ValleyWAQualeupWA Postcode 6394 State or territory Western Australia (WA) Localities 8 Council area Woodanilling; Kojonup; West Arthur Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6393 · Postcode 6395