Home Postcode finder SA Moonta Bay Moonta Bay postcode SA Moonta Bay 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 Moonta Bay business listing Be the first listing in Moonta Bay Common questionsWhat is the postcode for Moonta Bay?Moonta Bay, SA has the postcode 5558.What state is Moonta Bay in?Moonta Bay 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 Moonta Bay. Browse other postcodes in South Australia, or widen the search to every Australian postcode.