Home Postcode finder QLD Buchanan Buchanan postcode QLD Buchanan is a locality in Queensland covered by postcode 4816. Postcode 4816 State or territory Queensland (QLD) Region North QLD Add a free Buchanan business listing Be the first listing in Buchanan Common questionsWhat is the postcode for Buchanan?Buchanan, QLD has the postcode 4816.What state is Buchanan in?Buchanan is in Queensland (QLD).Does postcode 4816 cover more than one suburb?Yes. Postcode 4816 covers 40 localities, so the postcode alone does not identify Buchanan. Browse other postcodes in Queensland, or widen the search to every Australian postcode.