Home Postcode finder SA Gillentown Gillentown postcode SA Gillentown is a locality in South Australia covered by postcode 5453. Postcode 5453 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Gillentown business listing Be the first listing in Gillentown Common questionsWhat is the postcode for Gillentown?Gillentown, SA has the postcode 5453.What state is Gillentown in?Gillentown is in South Australia (SA).Does postcode 5453 cover more than one suburb?Yes. Postcode 5453 covers 16 localities, so the postcode alone does not identify Gillentown. Browse other postcodes in South Australia, or widen the search to every Australian postcode.