Home Postcode finder SA Foul Bay Foul Bay postcode SA Foul Bay is a locality in South Australia covered by postcode 5577. Postcode 5577 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Foul Bay business listing Be the first listing in Foul Bay Common questionsWhat is the postcode for Foul Bay?Foul Bay, SA has the postcode 5577.What state is Foul Bay in?Foul Bay is in South Australia (SA).Does postcode 5577 cover more than one suburb?Yes. Postcode 5577 covers 3 localities, so the postcode alone does not identify Foul Bay. Browse other postcodes in South Australia, or widen the search to every Australian postcode.