Home Postcode finder NSW Chatham Chatham postcode NSW Chatham 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 Chatham business listing Be the first listing in Chatham Common questionsWhat is the postcode for Chatham?Chatham, NSW has the postcode 2430.What state is Chatham in?Chatham 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 Chatham. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.