Home Postcode finder SA Wild Horse Plains Wild Horse Plains postcode SA Wild Horse Plains is a locality in South Australia covered by postcode 5501. Postcode 5501 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Wild Horse Plains business listing Be the first listing in Wild Horse Plains Common questionsWhat is the postcode for Wild Horse Plains?Wild Horse Plains, SA has the postcode 5501.What state is Wild Horse Plains in?Wild Horse Plains is in South Australia (SA).Does postcode 5501 cover more than one suburb?Yes. Postcode 5501 covers 14 localities, so the postcode alone does not identify Wild Horse Plains. Browse other postcodes in South Australia, or widen the search to every Australian postcode.