Home Postcode finder NSW Wallis Lake Wallis Lake postcode NSW Wallis Lake is a locality in New South Wales covered by postcode 2428. Postcode 2428 State or territory New South Wales (NSW) Region Hunter Add a free Wallis Lake business listing Be the first listing in Wallis Lake Common questionsWhat is the postcode for Wallis Lake?Wallis Lake, NSW has the postcode 2428.What state is Wallis Lake in?Wallis Lake is in New South Wales (NSW).Does postcode 2428 cover more than one suburb?Yes. Postcode 2428 covers 21 localities, so the postcode alone does not identify Wallis Lake. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.