Home Postcode finder SA Port Mannum Port Mannum postcode SA Port Mannum is a locality in South Australia covered by postcode 5238. Postcode 5238 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Port Mannum business listing Be the first listing in Port Mannum Common questionsWhat is the postcode for Port Mannum?Port Mannum, SA has the postcode 5238.What state is Port Mannum in?Port Mannum is in South Australia (SA).Does postcode 5238 cover more than one suburb?Yes. Postcode 5238 covers 31 localities, so the postcode alone does not identify Port Mannum. Browse other postcodes in South Australia, or widen the search to every Australian postcode.