Home Postcode finder SA Stanley Flat Stanley Flat postcode SA Stanley Flat is a locality in South Australia covered by postcode 5453. Postcode 5453 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Stanley Flat business listing Be the first listing in Stanley Flat Common questionsWhat is the postcode for Stanley Flat?Stanley Flat, SA has the postcode 5453.What state is Stanley Flat in?Stanley Flat is in South Australia (SA).Does postcode 5453 cover more than one suburb?Yes. Postcode 5453 covers 16 localities, so the postcode alone does not identify Stanley Flat. Browse other postcodes in South Australia, or widen the search to every Australian postcode.