Home Postcodes by state WA 6055 Postcode 6055 6055 is the postcode for 6 localities in WA: Caversham, Guildford, Hazelmere, Henley Brook, South Guildford and West Swan. Localities with postcode 6055CavershamWAGuildfordWAHazelmereWAHenley BrookWASouth GuildfordWAWest SwanWA Postcode 6055 State or territory Western Australia (WA) Localities 6 Council area Swan Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6054 · Postcode 6056