Home Postcode finder SA Port Julia Port Julia postcode SA Port Julia is a locality in South Australia covered by postcode 5575. Postcode 5575 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Port Julia business listing Be the first listing in Port Julia Common questionsWhat is the postcode for Port Julia?Port Julia, SA has the postcode 5575.What state is Port Julia in?Port Julia is in South Australia (SA).Does postcode 5575 cover more than one suburb?Yes. Postcode 5575 covers 17 localities, so the postcode alone does not identify Port Julia. Browse other postcodes in South Australia, or widen the search to every Australian postcode.