Home Postcode finder NSWDL St Huberts Island St Huberts Island postcode NSWDL St Huberts Island is a locality in New South Wales covered by postcode 2257. Postcode 2257 State or territory New South Wales (NSWDL) Region Gosford Add a free St Huberts Island business listing Be the first listing in St Huberts Island Common questionsWhat is the postcode for St Huberts Island?St Huberts Island, NSWDL has the postcode 2257.What state is St Huberts Island in?St Huberts Island is in New South Wales (NSWDL).Does postcode 2257 cover more than one suburb?Yes. Postcode 2257 covers 12 localities, so the postcode alone does not identify St Huberts Island. Browse other postcodes in New South Wales, or widen the search to every Australian postcode.