Home Postcode finder NSW Mayfield North Mayfield North postcode NSW Mayfield North is a locality in New South Wales covered by postcode 2304. Postcode 2304 State or territory New South Wales (NSW) Region Hunter Add a free Mayfield North business listing Be the first listing in Mayfield North Common questionsWhat is the postcode for Mayfield North?Mayfield North, NSW has the postcode 2304.What state is Mayfield North in?Mayfield North is in New South Wales (NSW).Does postcode 2304 cover more than one suburb?Yes. Postcode 2304 covers 7 localities, so the postcode alone does not identify Mayfield North. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.