Home Postcode finder SA Nantawarra Nantawarra postcode SA Nantawarra is a locality in South Australia covered by postcode 5550. Postcode 5550 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Nantawarra business listing Be the first listing in Nantawarra Common questionsWhat is the postcode for Nantawarra?Nantawarra, SA has the postcode 5550.What state is Nantawarra in?Nantawarra is in South Australia (SA).Does postcode 5550 cover more than one suburb?Yes. Postcode 5550 covers 8 localities, so the postcode alone does not identify Nantawarra. Browse other postcodes in South Australia, or widen the search to every Australian postcode.