Home Postcode finder WA Guilderton Guilderton postcode WA Guilderton is a locality in Western Australia covered by postcode 6041. Postcode 6041 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Guilderton business listing Be the first listing in Guilderton Common questionsWhat is the postcode for Guilderton?Guilderton, WA has the postcode 6041.What state is Guilderton in?Guilderton is in Western Australia (WA).Does postcode 6041 cover more than one suburb?Yes. Postcode 6041 covers 5 localities, so the postcode alone does not identify Guilderton. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.