Home Postcode finder SA Crystal Brook Crystal Brook postcode SA Crystal Brook is a locality in South Australia covered by postcode 5523. Postcode 5523 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Crystal Brook business listing More business listings in Crystal Brook Businesses in Crystal BrookCrystal Brook Primary School7 Mitchell St · 08 86362134 Common questionsWhat is the postcode for Crystal Brook?Crystal Brook, SA has the postcode 5523.What state is Crystal Brook in?Crystal Brook is in South Australia (SA).Does postcode 5523 cover more than one suburb?Yes. Postcode 5523 covers 10 localities, so the postcode alone does not identify Crystal Brook. Browse other postcodes in South Australia, or widen the search to every Australian postcode.