Home Postcode finder SA Bunbury Bunbury postcode SA Bunbury is a locality in South Australia covered by postcode 5266. Postcode 5266 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Bunbury business listing Be the first listing in Bunbury Common questionsWhat is the postcode for Bunbury?Bunbury, SA has the postcode 5266.What state is Bunbury in?Bunbury is in South Australia (SA).Does postcode 5266 cover more than one suburb?Yes. Postcode 5266 covers 4 localities, so the postcode alone does not identify Bunbury. Browse other postcodes in South Australia, or widen the search to every Australian postcode.