Home Postcode finder SA Petersville Petersville postcode SA Petersville is a locality in South Australia covered by postcode 5571. Postcode 5571 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Petersville business listing Be the first listing in Petersville Common questionsWhat is the postcode for Petersville?Petersville, SA has the postcode 5571.What state is Petersville in?Petersville is in South Australia (SA).Does postcode 5571 cover more than one suburb?Yes. Postcode 5571 covers 9 localities, so the postcode alone does not identify Petersville. Browse other postcodes in South Australia, or widen the search to every Australian postcode.