Home Postcode finder SA Deep Creek Deep Creek postcode SA Deep Creek is a locality in South Australia covered by postcode 5204. Postcode 5204 State or territory South Australia (SA) Region Adelaide Add a free Deep Creek business listing Be the first listing in Deep Creek Common questionsWhat is the postcode for Deep Creek?Deep Creek, SA has the postcode 5204.What state is Deep Creek in?Deep Creek is in South Australia (SA).Does postcode 5204 cover more than one suburb?Yes. Postcode 5204 covers 10 localities, so the postcode alone does not identify Deep Creek. Browse other postcodes in South Australia, or widen the search to every Australian postcode.