Home Postcode finder SA Campoona Campoona postcode SA Campoona is a locality in South Australia covered by postcode 5640. Postcode 5640 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Campoona business listing Be the first listing in Campoona Common questionsWhat is the postcode for Campoona?Campoona, SA has the postcode 5640.What state is Campoona in?Campoona is in South Australia (SA).Does postcode 5640 cover more than one suburb?Yes. Postcode 5640 covers 4 localities, so the postcode alone does not identify Campoona. Browse other postcodes in South Australia, or widen the search to every Australian postcode.