Home Postcode finder WA Mardie Mardie postcode WA Mardie is a locality in Western Australia covered by postcode 6714. Postcode 6714 State or territory Western Australia (WA) Region North West Suburbs Add a free Mardie business listing Be the first listing in Mardie Common questionsWhat is the postcode for Mardie?Mardie, WA has the postcode 6714.What state is Mardie in?Mardie is in Western Australia (WA).Does postcode 6714 cover more than one suburb?Yes. Postcode 6714 covers 20 localities, so the postcode alone does not identify Mardie. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.