Home Postcode finder SA Koonoona Koonoona postcode SA Koonoona is a locality in South Australia covered by postcode 5417. Postcode 5417 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Koonoona business listing Be the first listing in Koonoona Common questionsWhat is the postcode for Koonoona?Koonoona, SA has the postcode 5417.What state is Koonoona in?Koonoona is in South Australia (SA).Does postcode 5417 cover more than one suburb?Yes. Postcode 5417 covers 10 localities, so the postcode alone does not identify Koonoona. Browse other postcodes in South Australia, or widen the search to every Australian postcode.