Home Postcode finder QLD Thornton Beach Thornton Beach postcode QLD Thornton Beach is a locality in Queensland covered by postcode 4873. Postcode 4873 State or territory Queensland (QLD) Region North QLD Add a free Thornton Beach business listing Be the first listing in Thornton Beach Common questionsWhat is the postcode for Thornton Beach?Thornton Beach, QLD has the postcode 4873.What state is Thornton Beach in?Thornton Beach 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 Thornton Beach. Browse other postcodes in Queensland, or widen the search to every Australian postcode.