Home Postcode finder QLD Great Keppel Island Great Keppel Island postcode QLD Great Keppel Island is a locality in Queensland covered by postcode 4700. Postcode 4700 State or territory Queensland (QLD) Region Central QLD Add a free Great Keppel Island business listing Be the first listing in Great Keppel Island Common questionsWhat is the postcode for Great Keppel Island?Great Keppel Island, QLD has the postcode 4700.What state is Great Keppel Island in?Great Keppel Island is in Queensland (QLD).Does postcode 4700 cover more than one suburb?Yes. Postcode 4700 covers 12 localities, so the postcode alone does not identify Great Keppel Island. Browse other postcodes in Queensland, or widen the search to every Australian postcode.