Home Postcode finder SA Greenhill Greenhill postcode SA Greenhill is a locality in South Australia covered by postcode 5140. Postcode 5140 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Greenhill business listing Be the first listing in Greenhill Common questionsWhat is the postcode for Greenhill?Greenhill, SA has the postcode 5140.What state is Greenhill in?Greenhill is in South Australia (SA).Does postcode 5140 cover more than one suburb?No. Postcode 5140 covers Greenhill only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in South Australia, or widen the search to every Australian postcode.