Home Postcodes by state SA 5140 Postcode 5140 5140 is the postcode for Greenhill, SA. Localities with postcode 5140GreenhillSA Postcode 5140 State or territory South Australia (SA) Localities 1 Council area Adelaide Hills Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5139 · Postcode 5141