Home Postcode finder SA Gawler River Gawler River postcode SA Gawler River is a locality in South Australia covered by postcode 5118. Postcode 5118 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Gawler River business listing Be the first listing in Gawler River Common questionsWhat is the postcode for Gawler River?Gawler River, SA has the postcode 5118.What state is Gawler River in?Gawler River is in South Australia (SA).Does postcode 5118 cover more than one suburb?Yes. Postcode 5118 covers 16 localities, so the postcode alone does not identify Gawler River. Browse other postcodes in South Australia, or widen the search to every Australian postcode.