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