Home Postcode finder WA Warmun Warmun postcode WA Warmun is a locality in Western Australia covered by postcode 6743. Postcode 6743 State or territory Western Australia (WA) Region North West Suburbs Add a free Warmun business listing Be the first listing in Warmun Common questionsWhat is the postcode for Warmun?Warmun, WA has the postcode 6743.What state is Warmun in?Warmun is in Western Australia (WA).Does postcode 6743 cover more than one suburb?Yes. Postcode 6743 covers 6 localities, so the postcode alone does not identify Warmun. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.