Home Postcode finder NSW Markwell Markwell postcode NSW Markwell is a locality in New South Wales covered by postcode 2423. Postcode 2423 State or territory New South Wales (NSW) Region Hunter Add a free Markwell business listing Be the first listing in Markwell Common questionsWhat is the postcode for Markwell?Markwell, NSW has the postcode 2423.What state is Markwell in?Markwell is in New South Wales (NSW).Does postcode 2423 cover more than one suburb?Yes. Postcode 2423 covers 20 localities, so the postcode alone does not identify Markwell. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.