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