Home Postcode finder NSW Old Mill Old Mill postcode NSW Old Mill is a locality in New South Wales covered by postcode 2369. Postcode 2369 State or territory New South Wales (NSW) Region NSW North Coast Add a free Old Mill business listing Be the first listing in Old Mill Common questionsWhat is the postcode for Old Mill?Old Mill, NSW has the postcode 2369.What state is Old Mill in?Old Mill is in New South Wales (NSW).Does postcode 2369 cover more than one suburb?Yes. Postcode 2369 covers 3 localities, so the postcode alone does not identify Old Mill. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.