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