Home Postcode finder NSW Mount Dee Mount Dee postcode NSW Mount Dee 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 Mount Dee business listing Be the first listing in Mount Dee Common questionsWhat is the postcode for Mount Dee?Mount Dee, NSW has the postcode 2320.What state is Mount Dee in?Mount Dee 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 Mount Dee. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.