Home Postcode finder SA Stuart Stuart postcode SA Stuart is a locality in South Australia covered by postcode 5320. Postcode 5320 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Stuart business listing Be the first listing in Stuart Common questionsWhat is the postcode for Stuart?Stuart, SA has the postcode 5320.What state is Stuart in?Stuart is in South Australia (SA).Does postcode 5320 cover more than one suburb?Yes. Postcode 5320 covers 13 localities, so the postcode alone does not identify Stuart. Browse other postcodes in South Australia, or widen the search to every Australian postcode.