Home Postcode finder SA Willunga Willunga postcode SA Willunga is a locality in South Australia covered by postcode 5172. Postcode 5172 State or territory South Australia (SA) Region Adelaide Add a free Willunga business listing More business listings in Willunga Businesses in WillungaWillunga High School239 Main Rd · 08 85562105Willunga Primary School247 Main Rd · 08 85562234Willunga Waldorf School1 Jay Drive · 08 85562655 Common questionsWhat is the postcode for Willunga?Willunga, SA has the postcode 5172.What state is Willunga in?Willunga 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. Browse other postcodes in South Australia, or widen the search to every Australian postcode.