Home Postcode finder WA Mount Madden Mount Madden postcode WA Mount Madden is a locality in Western Australia covered by postcode 6356. Postcode 6356 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Mount Madden business listing Be the first listing in Mount Madden Common questionsWhat is the postcode for Mount Madden?Mount Madden, WA has the postcode 6356.What state is Mount Madden in?Mount Madden is in Western Australia (WA).Does postcode 6356 cover more than one suburb?Yes. Postcode 6356 covers 3 localities, so the postcode alone does not identify Mount Madden. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.