Home Postcode finder NSW Hamilton South Hamilton South postcode NSW Hamilton South is a locality in New South Wales covered by postcode 2303. Postcode 2303 State or territory New South Wales (NSW) Region Hunter Add a free Hamilton South business listing Be the first listing in Hamilton South Common questionsWhat is the postcode for Hamilton South?Hamilton South, NSW has the postcode 2303.What state is Hamilton South in?Hamilton South is in New South Wales (NSW).Does postcode 2303 cover more than one suburb?Yes. Postcode 2303 covers 3 localities, so the postcode alone does not identify Hamilton South. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.