Home Postcode finder SA Hill River Hill River postcode SA Hill River is a locality in South Australia covered by postcode 5453. Postcode 5453 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Hill River business listing Be the first listing in Hill River Common questionsWhat is the postcode for Hill River?Hill River, SA has the postcode 5453.What state is Hill River in?Hill River is in South Australia (SA).Does postcode 5453 cover more than one suburb?Yes. Postcode 5453 covers 16 localities, so the postcode alone does not identify Hill River. Browse other postcodes in South Australia, or widen the search to every Australian postcode.