Home Postcode finder WA Greenhills Greenhills postcode WA Greenhills 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 Greenhills business listing Be the first listing in Greenhills Common questionsWhat is the postcode for Greenhills?Greenhills, WA has the postcode 6302.What state is Greenhills in?Greenhills 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 Greenhills. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.