Home Postcode finder QLD Crystalbrook Crystalbrook postcode QLD Crystalbrook is a locality in Queensland covered by postcode 4871. Postcode 4871 State or territory Queensland (QLD) Region North QLD Add a free Crystalbrook business listing Be the first listing in Crystalbrook Common questionsWhat is the postcode for Crystalbrook?Crystalbrook, QLD has the postcode 4871.What state is Crystalbrook in?Crystalbrook is in Queensland (QLD).Does postcode 4871 cover more than one suburb?Yes. Postcode 4871 covers 103 localities, so the postcode alone does not identify Crystalbrook. Browse other postcodes in Queensland, or widen the search to every Australian postcode.