Home Postcode finder NSW Glen William Glen William postcode NSW Glen William is a locality in New South Wales covered by postcode 2321. Postcode 2321 State or territory New South Wales (NSW) Region Hunter Add a free Glen William business listing Be the first listing in Glen William Common questionsWhat is the postcode for Glen William?Glen William, NSW has the postcode 2321.What state is Glen William in?Glen William is in New South Wales (NSW).Does postcode 2321 cover more than one suburb?Yes. Postcode 2321 covers 20 localities, so the postcode alone does not identify Glen William. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.