Home Postcode finder WA Guildford Guildford postcode WA Guildford is a locality in Western Australia covered by postcode 6055. Postcode 6055 State or territory Western Australia (WA) Region North West Suburbs Add a free Guildford business listing More business listings in Guildford Businesses in GuildfordGuildford Grammar School11 Terrace Rd · 08 93779222Guildford Primary School125 Helena St · 08 93773255 Common questionsWhat is the postcode for Guildford?Guildford, WA has the postcode 6055.What state is Guildford in?Guildford is in Western Australia (WA).Does postcode 6055 cover more than one suburb?Yes. Postcode 6055 covers 6 localities, so the postcode alone does not identify Guildford. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.