Home Postcode finder SA Willunga South Willunga South postcode SA Willunga South is a locality in South Australia covered by postcode 5172. Postcode 5172 State or territory South Australia (SA) Region Adelaide Add a free Willunga South business listing Be the first listing in Willunga South Common questionsWhat is the postcode for Willunga South?Willunga South, SA has the postcode 5172.What state is Willunga South in?Willunga South is in South Australia (SA).Does postcode 5172 cover more than one suburb?Yes. Postcode 5172 covers 13 localities, so the postcode alone does not identify Willunga South. Browse other postcodes in South Australia, or widen the search to every Australian postcode.