Home Postcode finder SA Altona Altona postcode SA Altona is a locality in South Australia covered by postcode 5351. Postcode 5351 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Altona business listing Be the first listing in Altona Common questionsWhat is the postcode for Altona?Altona, SA has the postcode 5351.What state is Altona in?Altona is in South Australia (SA).Does postcode 5351 cover more than one suburb?Yes. Postcode 5351 covers 7 localities, so the postcode alone does not identify Altona. Browse other postcodes in South Australia, or widen the search to every Australian postcode.