Home Postcode finder SA Cassini Cassini postcode SA Cassini is a locality in South Australia covered by postcode 5223. Postcode 5223 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Cassini business listing Be the first listing in Cassini Common questionsWhat is the postcode for Cassini?Cassini, SA has the postcode 5223.What state is Cassini in?Cassini is in South Australia (SA).Does postcode 5223 cover more than one suburb?Yes. Postcode 5223 covers 30 localities, so the postcode alone does not identify Cassini. Browse other postcodes in South Australia, or widen the search to every Australian postcode.