Home Postcodes by state WA 6059 Postcode 6059 6059 is the postcode for Dianella, WA. Localities with postcode 6059DianellaWA Postcode 6059 State or territory Western Australia (WA) Localities 1 Council area Stirling Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6058 · Postcode 6060