Home Postcodes by state WA 6284 Postcode 6284 6284 is the postcode for 4 localities in WA: Baudin, Cowaramup, Gracetown and Treeton. Localities with postcode 6284BaudinWACowaramupWAGracetownWATreetonWA Postcode 6284 State or territory Western Australia (WA) Localities 4 Council area Augusta Margaret River Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6282 · Postcode 6285