Home Postcode finder SA East Moonta East Moonta postcode SA East Moonta is a locality in South Australia covered by postcode 5558. Postcode 5558 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free East Moonta business listing Be the first listing in East Moonta Common questionsWhat is the postcode for East Moonta?East Moonta, SA has the postcode 5558.What state is East Moonta in?East Moonta is in South Australia (SA).Does postcode 5558 cover more than one suburb?Yes. Postcode 5558 covers 14 localities, so the postcode alone does not identify East Moonta. Browse other postcodes in South Australia, or widen the search to every Australian postcode.