Home Postcode finder NSW Hamilton Hamilton postcode NSW Hamilton 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 business listing More business listings in Hamilton Businesses in HamiltonDental On Beaumont20 Beaumont Street · 0249292193Digital Spotlight1/28 Donald St, Hamilton New South Wales 2303, Australia · +61 2 4005 1616Hamilton Public SchoolTudor St · 02 49693577 Common questionsWhat is the postcode for Hamilton?Hamilton, NSW has the postcode 2303.What state is Hamilton in?Hamilton 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. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.