Home Postcode finder SA Kainton Kainton postcode SA Kainton is a locality in South Australia covered by postcode 5552. Postcode 5552 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Kainton business listing Be the first listing in Kainton Common questionsWhat is the postcode for Kainton?Kainton, SA has the postcode 5552.What state is Kainton in?Kainton is in South Australia (SA).Does postcode 5552 cover more than one suburb?Yes. Postcode 5552 covers 4 localities, so the postcode alone does not identify Kainton. Browse other postcodes in South Australia, or widen the search to every Australian postcode.