Home Postcode finder SA Koonibba Koonibba postcode SA Koonibba 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 Koonibba business listing Be the first listing in Koonibba Common questionsWhat is the postcode for Koonibba?Koonibba, SA has the postcode 5690.What state is Koonibba in?Koonibba 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 Koonibba. Browse other postcodes in South Australia, or widen the search to every Australian postcode.