Home Postcode finder WA Wallareenya Wallareenya postcode WA Wallareenya is a locality in Western Australia covered by postcode 6721. Postcode 6721 State or territory Western Australia (WA) Region North West Suburbs Add a free Wallareenya business listing Be the first listing in Wallareenya Common questionsWhat is the postcode for Wallareenya?Wallareenya, WA has the postcode 6721.What state is Wallareenya in?Wallareenya is in Western Australia (WA).Does postcode 6721 cover more than one suburb?Yes. Postcode 6721 covers 8 localities, so the postcode alone does not identify Wallareenya. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.