Home Postcode finder SA Alma Alma postcode SA Alma is a locality in South Australia covered by postcode 5401. Postcode 5401 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Alma business listing Be the first listing in Alma Common questionsWhat is the postcode for Alma?Alma, SA has the postcode 5401.What state is Alma in?Alma is in South Australia (SA).Does postcode 5401 cover more than one suburb?Yes. Postcode 5401 covers 3 localities, so the postcode alone does not identify Alma. Browse other postcodes in South Australia, or widen the search to every Australian postcode.