Home Postcode finder SA Port Willunga Port Willunga postcode SA Port Willunga is a locality in South Australia covered by postcode 5173. Postcode 5173 State or territory South Australia (SA) Region Adelaide Add a free Port Willunga business listing Be the first listing in Port Willunga Common questionsWhat is the postcode for Port Willunga?Port Willunga, SA has the postcode 5173.What state is Port Willunga in?Port Willunga is in South Australia (SA).Does postcode 5173 cover more than one suburb?Yes. Postcode 5173 covers 4 localities, so the postcode alone does not identify Port Willunga. Browse other postcodes in South Australia, or widen the search to every Australian postcode.