Home Postcode finder SA Wonna Wonna postcode SA Wonna is a locality in South Australia covered by postcode 5419. Postcode 5419 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Wonna business listing Be the first listing in Wonna Common questionsWhat is the postcode for Wonna?Wonna, SA has the postcode 5419.What state is Wonna in?Wonna is in South Australia (SA).Does postcode 5419 cover more than one suburb?Yes. Postcode 5419 covers 7 localities, so the postcode alone does not identify Wonna. Browse other postcodes in South Australia, or widen the search to every Australian postcode.