Home Postcodes by state SA 5020 Postcode 5020 5020 is the postcode for West Lakes Shore, SA. Localities with postcode 5020West Lakes ShoreSA Postcode 5020 State or territory South Australia (SA) Localities 1 Council area Charles Sturt Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5019 · Postcode 5021