Home Postcodes by state SA 5021 Postcode 5021 5021 is the postcode for West Lakes, SA. Localities with postcode 5021West LakesSA Postcode 5021 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 5020 · Postcode 5022