Home Postcode finder WA Malmalling Malmalling postcode WA Malmalling is a locality in Western Australia covered by postcode 6556. Postcode 6556 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Malmalling business listing Be the first listing in Malmalling Common questionsWhat is the postcode for Malmalling?Malmalling, WA has the postcode 6556.What state is Malmalling in?Malmalling is in Western Australia (WA).Does postcode 6556 cover more than one suburb?Yes. Postcode 6556 covers 5 localities, so the postcode alone does not identify Malmalling. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.