Home Postcode finder NSW Gunderbooka Gunderbooka postcode NSW Gunderbooka is a locality in New South Wales covered by postcode 2840. Postcode 2840 State or territory New South Wales (NSW) Region NSW Country West Add a free Gunderbooka business listing Be the first listing in Gunderbooka Common questionsWhat is the postcode for Gunderbooka?Gunderbooka, NSW has the postcode 2840.What state is Gunderbooka in?Gunderbooka is in New South Wales (NSW).Does postcode 2840 cover more than one suburb?Yes. Postcode 2840 covers 11 localities, so the postcode alone does not identify Gunderbooka. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.