Home Postcode finder SA Sampson Flat Sampson Flat postcode SA Sampson Flat is a locality in South Australia covered by postcode 5114. Postcode 5114 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Sampson Flat business listing Be the first listing in Sampson Flat Common questionsWhat is the postcode for Sampson Flat?Sampson Flat, SA has the postcode 5114.What state is Sampson Flat in?Sampson Flat is in South Australia (SA).Does postcode 5114 cover more than one suburb?Yes. Postcode 5114 covers 12 localities, so the postcode alone does not identify Sampson Flat. Browse other postcodes in South Australia, or widen the search to every Australian postcode.