Home Postcode finder SA Salem Salem postcode SA Salem is a locality in South Australia covered by postcode 5255. Postcode 5255 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Salem business listing Be the first listing in Salem Common questionsWhat is the postcode for Salem?Salem, SA has the postcode 5255.What state is Salem in?Salem is in South Australia (SA).Does postcode 5255 cover more than one suburb?Yes. Postcode 5255 covers 19 localities, so the postcode alone does not identify Salem. Browse other postcodes in South Australia, or widen the search to every Australian postcode.