Home Postcode finder SA Cooke Plains Cooke Plains postcode SA Cooke Plains is a locality in South Australia covered by postcode 5261. Postcode 5261 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Cooke Plains business listing Be the first listing in Cooke Plains Common questionsWhat is the postcode for Cooke Plains?Cooke Plains, SA has the postcode 5261.What state is Cooke Plains in?Cooke Plains is in South Australia (SA).Does postcode 5261 cover more than one suburb?Yes. Postcode 5261 covers 5 localities, so the postcode alone does not identify Cooke Plains. Browse other postcodes in South Australia, or widen the search to every Australian postcode.