Home Postcode finder QLD Darnley Island Darnley Island postcode QLD Darnley Island is a locality in Queensland covered by postcode 4875. Postcode 4875 State or territory Queensland (QLD) Region North QLD Add a free Darnley Island business listing Be the first listing in Darnley Island Common questionsWhat is the postcode for Darnley Island?Darnley Island, QLD has the postcode 4875.What state is Darnley Island in?Darnley Island is in Queensland (QLD).Does postcode 4875 cover more than one suburb?Yes. Postcode 4875 covers 17 localities, so the postcode alone does not identify Darnley Island. Browse other postcodes in Queensland, or widen the search to every Australian postcode.