Home Postcode finder NSW Upper Myall Upper Myall postcode NSW Upper Myall is a locality in New South Wales covered by postcode 2423. Postcode 2423 State or territory New South Wales (NSW) Region Hunter Add a free Upper Myall business listing Be the first listing in Upper Myall Common questionsWhat is the postcode for Upper Myall?Upper Myall, NSW has the postcode 2423.What state is Upper Myall in?Upper Myall is in New South Wales (NSW).Does postcode 2423 cover more than one suburb?Yes. Postcode 2423 covers 20 localities, so the postcode alone does not identify Upper Myall. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.