Home Postcode finder QLD Willowbank Willowbank postcode QLD Willowbank is a locality in Queensland covered by postcode 4306. Postcode 4306 State or territory Queensland (QLD) Region Western Suburbs Add a free Willowbank business listing Be the first listing in Willowbank Common questionsWhat is the postcode for Willowbank?Willowbank, QLD has the postcode 4306.What state is Willowbank in?Willowbank is in Queensland (QLD).Does postcode 4306 cover more than one suburb?Yes. Postcode 4306 covers 56 localities, so the postcode alone does not identify Willowbank. Browse other postcodes in Queensland, or widen the search to every Australian postcode.