Home Postcode finder NSW Dumaresq Island Dumaresq Island postcode NSW Dumaresq Island is a locality in New South Wales covered by postcode 2430. Postcode 2430 State or territory New South Wales (NSW) Region Hunter Add a free Dumaresq Island business listing Be the first listing in Dumaresq Island Common questionsWhat is the postcode for Dumaresq Island?Dumaresq Island, NSW has the postcode 2430.What state is Dumaresq Island in?Dumaresq Island is in New South Wales (NSW).Does postcode 2430 cover more than one suburb?Yes. Postcode 2430 covers 39 localities, so the postcode alone does not identify Dumaresq Island. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.