Home Postcode finder SA Ironstone Ironstone postcode SA Ironstone is a locality in South Australia covered by postcode 5222. Postcode 5222 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Ironstone business listing Be the first listing in Ironstone Common questionsWhat is the postcode for Ironstone?Ironstone, SA has the postcode 5222.What state is Ironstone in?Ironstone is in South Australia (SA).Does postcode 5222 cover more than one suburb?Yes. Postcode 5222 covers 17 localities, so the postcode alone does not identify Ironstone. Browse other postcodes in South Australia, or widen the search to every Australian postcode.