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