Home Postcodes by state WA 6390 Postcode 6390 6390 is the postcode for 11 localities in WA: Bannister, Boddington, Crossman, Lower Hotham, Marradong, Mount Cooke and 5 more. Localities with postcode 6390BannisterWABoddingtonWACrossmanWALower HothamWAMarradongWAMount CookeWAMount WellsWANorth BannisterWARanfordWAUpper MurrayWAWuramingWA Postcode 6390 State or territory Western Australia (WA) Localities 11 Council area Mainly Boddington, partly Wandering; Boddington; Wandering Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6386 · Postcode 6391