Home Postcode finder SA Yamba Yamba postcode SA Yamba is a locality in South Australia covered by postcode 5340. Postcode 5340 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Yamba business listing Be the first listing in Yamba Common questionsWhat is the postcode for Yamba?Yamba, SA has the postcode 5340.What state is Yamba in?Yamba is in South Australia (SA).Does postcode 5340 cover more than one suburb?Yes. Postcode 5340 covers 6 localities, so the postcode alone does not identify Yamba. Browse other postcodes in South Australia, or widen the search to every Australian postcode.