Home Postcodes by state WA Williamstown Williamstown postcode WA Williamstown is a locality in Western Australia covered by postcode 6430. Postcode 6430 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Council area Kalgoorlie-Boulder Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Add a free Williamstown business listing Be the first listing in Williamstown Suburbs near WilliamstownStraight-line distance between locality centres.Brown HillWA 6431 · 1.5 kmPiccadillyWA 6430 · 1.9 kmSouth KalgoorlieWA 6430 · 2.0 kmKalgoorlieWA 6430 · 2.0 kmMullingarWA 6430 · 2.1 kmParkestonWA 6434 · 2.3 kmLamingtonWA 6430 · 2.5 kmWest LamingtonWA 6430 · 3.4 kmTrafalgarWA 6431 · 3.5 kmFimistonWA 6432 · 3.8 kmSomervilleWA 6430 · 4.1 kmBoulderWA 6432 · 4.2 kmDistances to every suburb around Williamstown Also in postcode 6430BinduliWA 6430BroadwoodWA 6430HannansWA 6430KalgoorlieWA 6430KarlkurlaWA 6430LamingtonWA 6430MullingarWA 6430PiccadillyWA 6430SomervilleWA 6430South KalgoorlieWA 6430West KalgoorlieWA 6430West LamingtonWA 6430YilkariWA 6430 Other places called WilliamstownWilliamstownSA 5351WilliamstownVIC 3016 Common questionsWhat is the postcode for Williamstown?Williamstown, WA has the postcode 6430.What state is Williamstown in?Williamstown is in Western Australia (WA).What council is Williamstown in?Williamstown is in the Kalgoorlie-Boulder local government area.Does postcode 6430 cover more than one suburb?Yes. Postcode 6430 covers 14 localities, so the postcode alone does not identify Williamstown.What suburbs are near Williamstown?The closest are Brown Hill (1.5 km), Piccadilly (1.9 km), South Kalgoorlie (2.0 km), Kalgoorlie (2.0 km) and Mullingar (2.1 km). Distances are straight lines between locality centres. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.