Home Postcode finder WA Muluckine Muluckine postcode WA Muluckine is a locality in Western Australia covered by postcode 6401. Postcode 6401 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Muluckine business listing Be the first listing in Muluckine Common questionsWhat is the postcode for Muluckine?Muluckine, WA has the postcode 6401.What state is Muluckine in?Muluckine is in Western Australia (WA).Does postcode 6401 cover more than one suburb?Yes. Postcode 6401 covers 18 localities, so the postcode alone does not identify Muluckine. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.