Home Postcode finder SA Billiatt Billiatt postcode SA Billiatt is a locality in South Australia covered by postcode 5311. Postcode 5311 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Billiatt business listing Be the first listing in Billiatt Common questionsWhat is the postcode for Billiatt?Billiatt, SA has the postcode 5311.What state is Billiatt in?Billiatt is in South Australia (SA).Does postcode 5311 cover more than one suburb?Yes. Postcode 5311 covers 13 localities, so the postcode alone does not identify Billiatt. Browse other postcodes in South Australia, or widen the search to every Australian postcode.