Home Postcode finder SA Joslin Joslin postcode SA Joslin is a locality in South Australia covered by postcode 5070. Postcode 5070 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Joslin business listing Be the first listing in Joslin Common questionsWhat is the postcode for Joslin?Joslin, SA has the postcode 5070.What state is Joslin in?Joslin is in South Australia (SA).Does postcode 5070 cover more than one suburb?Yes. Postcode 5070 covers 9 localities, so the postcode alone does not identify Joslin. Browse other postcodes in South Australia, or widen the search to every Australian postcode.