Home Postcodes by state WA 6285 Postcode 6285 6285 is the postcode for 9 localities in WA: Bramley, Burnside, Gnarabup, Margaret River, Osmington, Prevelly and 3 more. Localities with postcode 6285BramleyWABurnsideWAGnarabupWAMargaret RiverWAOsmingtonWAPrevellyWARosa BrookWARosa GlenWASchroederWA Postcode 6285 State or territory Western Australia (WA) Localities 9 Council area Augusta Margaret River Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6284 · Postcode 6286