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