Home Postcode finder NSWDL Summer Island Summer Island postcode NSWDL Summer Island is a locality in New South Wales covered by postcode 2440. Postcode 2440 State or territory New South Wales (NSWDL) Region NSW North Coast Add a free Summer Island business listing Be the first listing in Summer Island Common questionsWhat is the postcode for Summer Island?Summer Island, NSWDL has the postcode 2440.What state is Summer Island in?Summer Island is in New South Wales (NSWDL).Does postcode 2440 cover more than one suburb?Yes. Postcode 2440 covers 48 localities, so the postcode alone does not identify Summer Island. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.