Home Postcode finder SA Osborne Osborne postcode SA Osborne is a locality in South Australia covered by postcode 5017. Postcode 5017 State or territory South Australia (SA) Region Adelaide Add a free Osborne business listing Be the first listing in Osborne Common questionsWhat is the postcode for Osborne?Osborne, SA has the postcode 5017.What state is Osborne in?Osborne is in South Australia (SA).Does postcode 5017 cover more than one suburb?Yes. Postcode 5017 covers 2 localities, so the postcode alone does not identify Osborne. Browse other postcodes in South Australia, or widen the search to every Australian postcode.