Home Postcodes by state SA 5351 Postcode 5351 5351 is the postcode for 7 localities in SA: Altona, Barossa Goldfields, Cockatoo Valley, Lyndoch, Mount Crawford, Pewsey Vale and 1 more. Localities with postcode 5351AltonaSABarossa GoldfieldsSACockatoo ValleySALyndochSAMount CrawfordSAPewsey ValeSAWilliamstownSA Postcode 5351 State or territory South Australia (SA) Localities 7 Council area Barossa Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 5350 · Postcode 5352