Home Postcode finder QLD Grasstree Beach Grasstree Beach postcode QLD Grasstree Beach is a locality in Queensland covered by postcode 4740. Postcode 4740 State or territory Queensland (QLD) Region Central QLD Add a free Grasstree Beach business listing Be the first listing in Grasstree Beach Common questionsWhat is the postcode for Grasstree Beach?Grasstree Beach, QLD has the postcode 4740.What state is Grasstree Beach in?Grasstree Beach is in Queensland (QLD).Does postcode 4740 cover more than one suburb?Yes. Postcode 4740 covers 50 localities, so the postcode alone does not identify Grasstree Beach. Browse other postcodes in Queensland, or widen the search to every Australian postcode.