Home Postcode finder SA Mount Cooper Mount Cooper postcode SA Mount Cooper is a locality in South Australia covered by postcode 5671. Postcode 5671 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Mount Cooper business listing Be the first listing in Mount Cooper Common questionsWhat is the postcode for Mount Cooper?Mount Cooper, SA has the postcode 5671.What state is Mount Cooper in?Mount Cooper is in South Australia (SA).Does postcode 5671 cover more than one suburb?Yes. Postcode 5671 covers 8 localities, so the postcode alone does not identify Mount Cooper. Browse other postcodes in South Australia, or widen the search to every Australian postcode.