Home Postcode finder SA Bletchley Bletchley postcode SA Bletchley 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 Bletchley business listing Be the first listing in Bletchley Common questionsWhat is the postcode for Bletchley?Bletchley, SA has the postcode 5255.What state is Bletchley in?Bletchley 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 Bletchley. Browse other postcodes in South Australia, or widen the search to every Australian postcode.