Home Postcode finder NSW Hillsborough Hillsborough postcode NSW Hillsborough is a locality in New South Wales covered by postcode 2320. Postcode 2320 State or territory New South Wales (NSW) Region Hunter Add a free Hillsborough business listing More business listings in Hillsborough Businesses in HillsboroughGlendon SchoolWaratah Ave · 02 49433479 Common questionsWhat is the postcode for Hillsborough?Hillsborough, NSW has the postcode 2320.What state is Hillsborough in?Hillsborough is in New South Wales (NSW).Does postcode 2320 cover more than one suburb?Yes. Postcode 2320 covers 30 localities, so the postcode alone does not identify Hillsborough. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.