Home Postcode finder SA Western River Western River postcode SA Western River is a locality in South Australia covered by postcode 5223. Postcode 5223 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Western River business listing Be the first listing in Western River Common questionsWhat is the postcode for Western River?Western River, SA has the postcode 5223.What state is Western River in?Western River is in South Australia (SA).Does postcode 5223 cover more than one suburb?Yes. Postcode 5223 covers 30 localities, so the postcode alone does not identify Western River. Browse other postcodes in South Australia, or widen the search to every Australian postcode.