Home Postcode finder NSW Harpers Hill Harpers Hill postcode NSW Harpers Hill 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 Harpers Hill business listing Be the first listing in Harpers Hill Common questionsWhat is the postcode for Harpers Hill?Harpers Hill, NSW has the postcode 2321.What state is Harpers Hill in?Harpers Hill 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 Harpers Hill. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.