Home Postcode finder WA Millendon Millendon postcode WA Millendon is a locality in Western Australia covered by postcode 6056. Postcode 6056 State or territory Western Australia (WA) Region North West Suburbs Add a free Millendon business listing Be the first listing in Millendon Common questionsWhat is the postcode for Millendon?Millendon, WA has the postcode 6056.What state is Millendon in?Millendon is in Western Australia (WA).Does postcode 6056 cover more than one suburb?Yes. Postcode 6056 covers 17 localities, so the postcode alone does not identify Millendon. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.