Home Postcode finder SA Purnong Purnong postcode SA Purnong is a locality in South Australia covered by postcode 5238. Postcode 5238 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Purnong business listing Be the first listing in Purnong Common questionsWhat is the postcode for Purnong?Purnong, SA has the postcode 5238.What state is Purnong in?Purnong is in South Australia (SA).Does postcode 5238 cover more than one suburb?Yes. Postcode 5238 covers 31 localities, so the postcode alone does not identify Purnong. Browse other postcodes in South Australia, or widen the search to every Australian postcode.