Home Postcode finder SA Melton Melton postcode SA Melton is a locality in South Australia covered by postcode 5555. Postcode 5555 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Melton business listing Be the first listing in Melton Common questionsWhat is the postcode for Melton?Melton, SA has the postcode 5555.What state is Melton in?Melton is in South Australia (SA).Does postcode 5555 cover more than one suburb?Yes. Postcode 5555 covers 11 localities, so the postcode alone does not identify Melton. Browse other postcodes in South Australia, or widen the search to every Australian postcode.