Home Postcode finder WA Gap Ridge Gap Ridge postcode WA Gap Ridge is a locality in Western Australia covered by postcode 6714. Postcode 6714 State or territory Western Australia (WA) Region North West Suburbs Add a free Gap Ridge business listing Be the first listing in Gap Ridge Common questionsWhat is the postcode for Gap Ridge?Gap Ridge, WA has the postcode 6714.What state is Gap Ridge in?Gap Ridge is in Western Australia (WA).Does postcode 6714 cover more than one suburb?Yes. Postcode 6714 covers 20 localities, so the postcode alone does not identify Gap Ridge. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.