Home Postcode finder SA New Town New Town postcode SA New Town is a locality in South Australia covered by postcode 5554. Postcode 5554 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free New Town business listing Be the first listing in New Town Common questionsWhat is the postcode for New Town?New Town, SA has the postcode 5554.What state is New Town in?New Town is in South Australia (SA).Does postcode 5554 cover more than one suburb?Yes. Postcode 5554 covers 10 localities, so the postcode alone does not identify New Town. Browse other postcodes in South Australia, or widen the search to every Australian postcode.