Home Postcode finder SA Steinfeld Steinfeld postcode SA Steinfeld 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 Steinfeld business listing Be the first listing in Steinfeld Common questionsWhat is the postcode for Steinfeld?Steinfeld, SA has the postcode 5356.What state is Steinfeld in?Steinfeld 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 Steinfeld. Browse other postcodes in South Australia, or widen the search to every Australian postcode.