Home Postcodes by state WA 6450 Postcode 6450 6450 is the postcode for 23 localities in WA: Bandy Creek, Beaumont, Boyatup, Cape Le Grand, Cascade, Castletown and 17 more. Localities with postcode 6450Bandy CreekWABeaumontWABoyatupWACape Le GrandWACascadeWACastletownWAChadwickWACondingupWACoomalbidgupWADalyupWAEast MunglinupWAEsperanceWAHowickWAMerivaleWAMonjingupWAMunglinupWAMyrupWANeridupWANulsenWAPink LakeWASinclairWAWest BeachWAWindaboutWA Postcode 6450 State or territory Western Australia (WA) Localities 23 Council area Esperance; Ravensthorpe Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6448 · Postcode 6452