Home Postcode finder NSW Myall Lake Myall Lake postcode NSW Myall Lake 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 Myall Lake business listing Be the first listing in Myall Lake Common questionsWhat is the postcode for Myall Lake?Myall Lake, NSW has the postcode 2423.What state is Myall Lake in?Myall Lake 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 Myall Lake. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.