Home Postcode finder NSW Number One Number One postcode NSW Number One is a locality in New South Wales covered by postcode 2424. Postcode 2424 State or territory New South Wales (NSW) Region Hunter Add a free Number One business listing Be the first listing in Number One Common questionsWhat is the postcode for Number One?Number One, NSW has the postcode 2424.What state is Number One in?Number One is in New South Wales (NSW).Does postcode 2424 cover more than one suburb?Yes. Postcode 2424 covers 9 localities, so the postcode alone does not identify Number One. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.