Home Postcode finder SA Port Arthur Port Arthur postcode SA Port Arthur is a locality in South Australia covered by postcode 5572. Postcode 5572 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Port Arthur business listing Be the first listing in Port Arthur Common questionsWhat is the postcode for Port Arthur?Port Arthur, SA has the postcode 5572.What state is Port Arthur in?Port Arthur is in South Australia (SA).Does postcode 5572 cover more than one suburb?Yes. Postcode 5572 covers 2 localities, so the postcode alone does not identify Port Arthur. Browse other postcodes in South Australia, or widen the search to every Australian postcode.