Home Postcode finder QLD Crystal Brook Crystal Brook postcode QLD Crystal Brook is a locality in Queensland covered by postcode 4800. Postcode 4800 State or territory Queensland (QLD) Region Central QLD Add a free Crystal Brook business listing Be the first listing in Crystal Brook Common questionsWhat is the postcode for Crystal Brook?Crystal Brook, QLD has the postcode 4800.What state is Crystal Brook in?Crystal Brook is in Queensland (QLD).Does postcode 4800 cover more than one suburb?Yes. Postcode 4800 covers 38 localities, so the postcode alone does not identify Crystal Brook. Browse other postcodes in Queensland, or widen the search to every Australian postcode.