Home Postcode finder NSW Mellong Mellong postcode NSW Mellong is a locality in New South Wales covered by postcode 2756. Postcode 2756 State or territory New South Wales (NSW) Region Nepean Add a free Mellong business listing Be the first listing in Mellong Common questionsWhat is the postcode for Mellong?Mellong, NSW has the postcode 2756.What state is Mellong in?Mellong is in New South Wales (NSW).Does postcode 2756 cover more than one suburb?Yes. Postcode 2756 covers 28 localities, so the postcode alone does not identify Mellong. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.