Home Postcodes by state WA 6108 Postcode 6108 6108 is the postcode for Thornlie, WA. Localities with postcode 6108ThornlieWA Postcode 6108 State or territory Western Australia (WA) Localities 1 Council area Gosnells Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6107 · Postcode 6109