Home Postcode finder NSW Glen Allen Glen Allen postcode NSW Glen Allen is a locality in New South Wales covered by postcode 2631. Postcode 2631 State or territory New South Wales (NSW) Region Canberra Add a free Glen Allen business listing Be the first listing in Glen Allen Common questionsWhat is the postcode for Glen Allen?Glen Allen, NSW has the postcode 2631.What state is Glen Allen in?Glen Allen is in New South Wales (NSW).Does postcode 2631 cover more than one suburb?Yes. Postcode 2631 covers 12 localities, so the postcode alone does not identify Glen Allen. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.