Home Postcode finder SA Brentwood Brentwood postcode SA Brentwood is a locality in South Australia covered by postcode 5575. Postcode 5575 State or territory South Australia (SA) Region Sa Subs Near 1 Add a free Brentwood business listing Be the first listing in Brentwood Common questionsWhat is the postcode for Brentwood?Brentwood, SA has the postcode 5575.What state is Brentwood in?Brentwood is in South Australia (SA).Does postcode 5575 cover more than one suburb?Yes. Postcode 5575 covers 17 localities, so the postcode alone does not identify Brentwood. Browse other postcodes in South Australia, or widen the search to every Australian postcode.