Home Postcodes by state WA 6393 Postcode 6393 6393 is the postcode for 2 localities in WA: Duranillin and Moodiarrup. Localities with postcode 6393DuranillinWAMoodiarrupWA Postcode 6393 State or territory Western Australia (WA) Localities 2 Council area West Arthur Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6392 · Postcode 6394