Home Postcode finder NSW Maddens Plains Maddens Plains postcode NSW Maddens Plains is a locality in New South Wales covered by postcode 2508. Postcode 2508 State or territory New South Wales (NSW) Region Illawarra Add a free Maddens Plains business listing Be the first listing in Maddens Plains Common questionsWhat is the postcode for Maddens Plains?Maddens Plains, NSW has the postcode 2508.What state is Maddens Plains in?Maddens Plains is in New South Wales (NSW).Does postcode 2508 cover more than one suburb?Yes. Postcode 2508 covers 9 localities, so the postcode alone does not identify Maddens Plains. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.