Home Postcode finder NSW Williamsdale Williamsdale postcode NSW Williamsdale is a locality in New South Wales covered by postcode 2620. Postcode 2620 State or territory New South Wales (NSW) Region Canberra Add a free Williamsdale business listing Be the first listing in Williamsdale Common questionsWhat is the postcode for Williamsdale?Williamsdale, NSW has the postcode 2620.What state is Williamsdale in?Williamsdale is in New South Wales (NSW).Does postcode 2620 cover more than one suburb?Yes. Postcode 2620 covers 29 localities, so the postcode alone does not identify Williamsdale. It also appears in 2 states or territories, so it does not identify a state either. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.