Home Postcode finder SA Banksia Park Banksia Park postcode SA Banksia Park is a locality in South Australia covered by postcode 5091. Postcode 5091 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Banksia Park business listing Be the first listing in Banksia Park Common questionsWhat is the postcode for Banksia Park?Banksia Park, SA has the postcode 5091.What state is Banksia Park in?Banksia Park is in South Australia (SA).Does postcode 5091 cover more than one suburb?Yes. Postcode 5091 covers 3 localities, so the postcode alone does not identify Banksia Park. Browse other postcodes in South Australia, or widen the search to every Australian postcode.