Home Postcode finder WA Borderdale Borderdale postcode WA Borderdale is a locality in Western Australia covered by postcode 6320. Postcode 6320 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Borderdale business listing Be the first listing in Borderdale Common questionsWhat is the postcode for Borderdale?Borderdale, WA has the postcode 6320.What state is Borderdale in?Borderdale is in Western Australia (WA).Does postcode 6320 cover more than one suburb?Yes. Postcode 6320 covers 7 localities, so the postcode alone does not identify Borderdale. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.