Home Postcode finder SA Blakiston Blakiston postcode SA Blakiston is a locality in South Australia covered by postcode 5250. Postcode 5250 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Blakiston business listing Be the first listing in Blakiston Common questionsWhat is the postcode for Blakiston?Blakiston, SA has the postcode 5250.What state is Blakiston in?Blakiston is in South Australia (SA).Does postcode 5250 cover more than one suburb?Yes. Postcode 5250 covers 3 localities, so the postcode alone does not identify Blakiston. Browse other postcodes in South Australia, or widen the search to every Australian postcode.