Home Postcode finder SA Couch Beach Couch Beach postcode SA Couch Beach is a locality in South Australia covered by postcode 5575. Postcode 5575 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Couch Beach business listing Be the first listing in Couch Beach Common questionsWhat is the postcode for Couch Beach?Couch Beach, SA has the postcode 5575.What state is Couch Beach in?Couch Beach is in South Australia (SA).Does postcode 5575 cover more than one suburb?Yes. Postcode 5575 covers 17 localities, so the postcode alone does not identify Couch Beach. Browse other postcodes in South Australia, or widen the search to every Australian postcode.