Home Postcode finder SA Cook Cook postcode SA Cook is a locality in South Australia covered by postcode 5710. Postcode 5710 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Cook business listing Be the first listing in Cook Common questionsWhat is the postcode for Cook?Cook, SA has the postcode 5710.What state is Cook in?Cook is in South Australia (SA).Does postcode 5710 cover more than one suburb?Yes. Postcode 5710 covers 11 localities, so the postcode alone does not identify Cook. Browse other postcodes in South Australia, or widen the search to every Australian postcode.