Home Postcodes by state WA 6338 Postcode 6338 6338 is the postcode for 9 localities in WA: Amelup, Borden, Boxwood Hill, Bremer Bay, Magitup, Monjebup and 3 more. Localities with postcode 6338AmelupWABordenWABoxwood HillWABremer BayWAMagitupWAMonjebupWANalyerlupWANorth StirlingsWAStirling Range National ParkWA Postcode 6338 State or territory Western Australia (WA) Localities 9 Council area Gnowangerup; Jerramungup; Mainly Plantagenet, partly Gnowangerup Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6337 · Postcode 6341