Home Postcode finder SA Island Beach Island Beach postcode SA Island Beach is a locality in South Australia covered by postcode 5222. Postcode 5222 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Island Beach business listing Be the first listing in Island Beach Common questionsWhat is the postcode for Island Beach?Island Beach, SA has the postcode 5222.What state is Island Beach in?Island Beach is in South Australia (SA).Does postcode 5222 cover more than one suburb?Yes. Postcode 5222 covers 17 localities, so the postcode alone does not identify Island Beach. Browse other postcodes in South Australia, or widen the search to every Australian postcode.