Home Postcode finder WA Gibb Gibb postcode WA Gibb is a locality in Western Australia covered by postcode 6743. Postcode 6743 State or territory Western Australia (WA) Region North West Suburbs Add a free Gibb business listing Be the first listing in Gibb Common questionsWhat is the postcode for Gibb?Gibb, WA has the postcode 6743.What state is Gibb in?Gibb is in Western Australia (WA).Does postcode 6743 cover more than one suburb?Yes. Postcode 6743 covers 6 localities, so the postcode alone does not identify Gibb. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.