Home Postcodes by state SA 5081 Postcode 5081 5081 is the postcode for 6 localities in SA: Collinswood, Gilberton, Medindie, Medindie Gardens, Vale Park and Walkerville. Localities with postcode 5081CollinswoodSAGilbertonSAMedindieSAMedindie GardensSAVale ParkSAWalkervilleSA Postcode 5081 State or territory South Australia (SA) Localities 6 Council area Prospect; Walkerville Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5076 · Postcode 5082