Home Postcode finder NSW Buchanan Buchanan postcode NSW Buchanan is a locality in New South Wales covered by postcode 2323. Postcode 2323 State or territory New South Wales (NSW) Region Hunter Add a free Buchanan business listing Be the first listing in Buchanan Common questionsWhat is the postcode for Buchanan?Buchanan, NSW has the postcode 2323.What state is Buchanan in?Buchanan is in New South Wales (NSW).Does postcode 2323 cover more than one suburb?Yes. Postcode 2323 covers 14 localities, so the postcode alone does not identify Buchanan. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.