Home Postcode finder NSW Newcastle East Newcastle East postcode NSW Newcastle East is a locality in New South Wales covered by postcode 2300. Postcode 2300 State or territory New South Wales (NSW) Region Hunter Add a free Newcastle East business listing Be the first listing in Newcastle East Common questionsWhat is the postcode for Newcastle East?Newcastle East, NSW has the postcode 2300.What state is Newcastle East in?Newcastle East is in New South Wales (NSW).Does postcode 2300 cover more than one suburb?Yes. Postcode 2300 covers 5 localities, so the postcode alone does not identify Newcastle East. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.