Home Postcodes by state SA Williamstown Williamstown postcode SA Williamstown is a locality in South Australia covered by postcode 5351. Postcode 5351 State or territory South Australia (SA) Region Sa Subs Near 1 Council area Barossa Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Add a free Williamstown business listing More business listings in Williamstown Suburbs near WilliamstownStraight-line distance between locality centres.Cockatoo ValleySA 5351 · 7.6 kmBarossa GoldfieldsSA 5351 · 7.7 kmLyndochSA 5351 · 7.8 kmPewsey ValeSA 5351 · 7.9 kmAltonaSA 5351 · 8.0 kmMount CrawfordSA 5351 · 8.3 kmWarrenSA 5233 · 8.8 kmSandy CreekSA 5350 · 9.6 kmHumbug ScrubSA 5114 · 10.6 kmRowland FlatSA 5352 · 10.8 kmUleyburySA 5114 · 10.8 kmYattalungaSA 5114 · 11.3 km Businesses in WilliamstownWilliamstown Primary School5 Margaret St · 08 85246289 Also in postcode 5351AltonaSA 5351Barossa GoldfieldsSA 5351Cockatoo ValleySA 5351LyndochSA 5351Mount CrawfordSA 5351Pewsey ValeSA 5351 Other places called WilliamstownWilliamstownVIC 3016WilliamstownWA 6430 Common questionsWhat is the postcode for Williamstown?Williamstown, SA has the postcode 5351.What state is Williamstown in?Williamstown is in South Australia (SA).What council is Williamstown in?Williamstown is in the Barossa local government area.Does postcode 5351 cover more than one suburb?Yes. Postcode 5351 covers 7 localities, so the postcode alone does not identify Williamstown.What suburbs are near Williamstown?The closest are Cockatoo Valley (7.6 km), Barossa Goldfields (7.7 km), Lyndoch (7.8 km), Pewsey Vale (7.9 km) and Altona (8.0 km). Distances are straight lines between locality centres. Browse other postcodes in South Australia, or widen the search to every Australian postcode.