Home Postcode finder WA Gwambygine Gwambygine postcode WA Gwambygine is a locality in Western Australia covered by postcode 6302. Postcode 6302 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Gwambygine business listing Be the first listing in Gwambygine Common questionsWhat is the postcode for Gwambygine?Gwambygine, WA has the postcode 6302.What state is Gwambygine in?Gwambygine is in Western Australia (WA).Does postcode 6302 cover more than one suburb?Yes. Postcode 6302 covers 23 localities, so the postcode alone does not identify Gwambygine. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.