Home Postcode finder SA White Well Corner White Well Corner postcode SA White Well Corner is a locality in South Australia covered by postcode 5690. Postcode 5690 State or territory South Australia (SA) Region SA Outer Suburbs Add a free White Well Corner business listing Be the first listing in White Well Corner Common questionsWhat is the postcode for White Well Corner?White Well Corner, SA has the postcode 5690.What state is White Well Corner in?White Well Corner is in South Australia (SA).Does postcode 5690 cover more than one suburb?Yes. Postcode 5690 covers 19 localities, so the postcode alone does not identify White Well Corner. Browse other postcodes in South Australia, or widen the search to every Australian postcode.