Home Postcodes by state WA 6017 Postcode 6017 6017 is the postcode for 2 localities in WA: Herdsman and Osborne Park. Localities with postcode 6017HerdsmanWAOsborne ParkWA Postcode 6017 State or territory Western Australia (WA) Localities 2 Council area Stirling Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6016 · Postcode 6018