Home Postcode finder SA Reid Reid postcode SA Reid is a locality in South Australia covered by postcode 5118. Postcode 5118 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Reid business listing Be the first listing in Reid Common questionsWhat is the postcode for Reid?Reid, SA has the postcode 5118.What state is Reid in?Reid is in South Australia (SA).Does postcode 5118 cover more than one suburb?Yes. Postcode 5118 covers 16 localities, so the postcode alone does not identify Reid. Browse other postcodes in South Australia, or widen the search to every Australian postcode.