Home Postcode finder WA Gairdner Gairdner postcode WA Gairdner is a locality in Western Australia covered by postcode 6337. Postcode 6337 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Gairdner business listing Be the first listing in Gairdner Common questionsWhat is the postcode for Gairdner?Gairdner, WA has the postcode 6337.What state is Gairdner in?Gairdner is in Western Australia (WA).Does postcode 6337 cover more than one suburb?Yes. Postcode 6337 covers 5 localities, so the postcode alone does not identify Gairdner. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.