Home Postcode finder NSW Mayfield East Mayfield East postcode NSW Mayfield East 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 East business listing More business listings in Mayfield East Businesses in Mayfield EastSWS Signage Newcastle48 Industrial Drive, Mayfield East NSW, Australia · 0249600633 Common questionsWhat is the postcode for Mayfield East?Mayfield East, NSW has the postcode 2304.What state is Mayfield East in?Mayfield East 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 East. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.