Home Postcodes by state SA 5064 Postcode 5064 5064 is the postcode for 6 localities in SA: Glen Osmond, Glenunga, Mount Osmond, Myrtle Bank, St Georges and Urrbrae. Localities with postcode 5064Glen OsmondSAGlenungaSAMount OsmondSAMyrtle BankSASt GeorgesSAUrrbraeSA Postcode 5064 State or territory South Australia (SA) Localities 6 Council area Burnside; Unley; Mitcham Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5063 · Postcode 5065