Home Postcode finder SA Petina Petina postcode SA Petina is a locality in South Australia covered by postcode 5680. Postcode 5680 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Petina business listing Be the first listing in Petina Common questionsWhat is the postcode for Petina?Petina, SA has the postcode 5680.What state is Petina in?Petina is in South Australia (SA).Does postcode 5680 cover more than one suburb?Yes. Postcode 5680 covers 20 localities, so the postcode alone does not identify Petina. Browse other postcodes in South Australia, or widen the search to every Australian postcode.