Home Postcode finder SA St Kitts St Kitts postcode SA St Kitts is a locality in South Australia covered by postcode 5356. Postcode 5356 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free St Kitts business listing Be the first listing in St Kitts Common questionsWhat is the postcode for St Kitts?St Kitts, SA has the postcode 5356.What state is St Kitts in?St Kitts is in South Australia (SA).Does postcode 5356 cover more than one suburb?Yes. Postcode 5356 covers 7 localities, so the postcode alone does not identify St Kitts. Browse other postcodes in South Australia, or widen the search to every Australian postcode.