Home Postcode finder QLD Diwan Diwan postcode QLD Diwan is a locality in Queensland covered by postcode 4873. Postcode 4873 State or territory Queensland (QLD) Region North QLD Add a free Diwan business listing Be the first listing in Diwan Common questionsWhat is the postcode for Diwan?Diwan, QLD has the postcode 4873.What state is Diwan in?Diwan is in Queensland (QLD).Does postcode 4873 cover more than one suburb?Yes. Postcode 4873 covers 29 localities, so the postcode alone does not identify Diwan. Browse other postcodes in Queensland, or widen the search to every Australian postcode.