Home Postcode finder SA Marks Landing Marks Landing postcode SA Marks Landing is a locality in South Australia covered by postcode 5354. Postcode 5354 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Marks Landing business listing Be the first listing in Marks Landing Common questionsWhat is the postcode for Marks Landing?Marks Landing, SA has the postcode 5354.What state is Marks Landing in?Marks Landing is in South Australia (SA).Does postcode 5354 cover more than one suburb?Yes. Postcode 5354 covers 10 localities, so the postcode alone does not identify Marks Landing. Browse other postcodes in South Australia, or widen the search to every Australian postcode.