Home Postcode finder SA Western Flat Western Flat postcode SA Western Flat is a locality in South Australia covered by postcode 5268. Postcode 5268 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Western Flat business listing Be the first listing in Western Flat Common questionsWhat is the postcode for Western Flat?Western Flat, SA has the postcode 5268.What state is Western Flat in?Western Flat is in South Australia (SA).Does postcode 5268 cover more than one suburb?Yes. Postcode 5268 covers 8 localities, so the postcode alone does not identify Western Flat. Browse other postcodes in South Australia, or widen the search to every Australian postcode.