Home Postcode finder QLD Dunwich Dunwich postcode QLD Dunwich is a locality in Queensland covered by postcode 4183. Postcode 4183 State or territory Queensland (QLD) Region South Subs Add a free Dunwich business listing Be the first listing in Dunwich Common questionsWhat is the postcode for Dunwich?Dunwich, QLD has the postcode 4183.What state is Dunwich in?Dunwich is in Queensland (QLD).Does postcode 4183 cover more than one suburb?Yes. Postcode 4183 covers 5 localities, so the postcode alone does not identify Dunwich. Browse other postcodes in Queensland, or widen the search to every Australian postcode.