Home Postcode finder SA Hincks Hincks postcode SA Hincks is a locality in South Australia covered by postcode 5603. Postcode 5603 State or territory South Australia (SA) Region SA Outer Suburbs Add a free Hincks business listing Be the first listing in Hincks Common questionsWhat is the postcode for Hincks?Hincks, SA has the postcode 5603.What state is Hincks in?Hincks is in South Australia (SA).Does postcode 5603 cover more than one suburb?Yes. Postcode 5603 covers 4 localities, so the postcode alone does not identify Hincks. Browse other postcodes in South Australia, or widen the search to every Australian postcode.