Home Postcode finder SA Huddleston Huddleston postcode SA Huddleston is a locality in South Australia covered by postcode 5523. Postcode 5523 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Huddleston business listing Be the first listing in Huddleston Common questionsWhat is the postcode for Huddleston?Huddleston, SA has the postcode 5523.What state is Huddleston in?Huddleston is in South Australia (SA).Does postcode 5523 cover more than one suburb?Yes. Postcode 5523 covers 10 localities, so the postcode alone does not identify Huddleston. Browse other postcodes in South Australia, or widen the search to every Australian postcode.