Home Postcode finder SA Pike River Pike River postcode SA Pike River is a locality in South Australia covered by postcode 5340. Postcode 5340 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Pike River business listing Be the first listing in Pike River Common questionsWhat is the postcode for Pike River?Pike River, SA has the postcode 5340.What state is Pike River in?Pike River is in South Australia (SA).Does postcode 5340 cover more than one suburb?Yes. Postcode 5340 covers 6 localities, so the postcode alone does not identify Pike River. Browse other postcodes in South Australia, or widen the search to every Australian postcode.