Home Postcode finder SA Port Augusta North Port Augusta North postcode SA Port Augusta North is a locality in South Australia covered by postcode 5700. Postcode 5700 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Port Augusta North business listing Be the first listing in Port Augusta North Common questionsWhat is the postcode for Port Augusta North?Port Augusta North, SA has the postcode 5700.What state is Port Augusta North in?Port Augusta North is in South Australia (SA).Does postcode 5700 cover more than one suburb?Yes. Postcode 5700 covers 8 localities, so the postcode alone does not identify Port Augusta North. Browse other postcodes in South Australia, or widen the search to every Australian postcode.