Home Postcode finder WA Molloy Island Molloy Island postcode WA Molloy Island is a locality in Western Australia covered by postcode 6290. Postcode 6290 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Molloy Island business listing Be the first listing in Molloy Island Common questionsWhat is the postcode for Molloy Island?Molloy Island, WA has the postcode 6290.What state is Molloy Island in?Molloy Island is in Western Australia (WA).Does postcode 6290 cover more than one suburb?Yes. Postcode 6290 covers 6 localities, so the postcode alone does not identify Molloy Island. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.