Home Postcode finder WA Waterbank Waterbank postcode WA Waterbank is a locality in Western Australia covered by postcode 6725. Postcode 6725 State or territory Western Australia (WA) Region North West Suburbs Add a free Waterbank business listing Be the first listing in Waterbank Common questionsWhat is the postcode for Waterbank?Waterbank, WA has the postcode 6725.What state is Waterbank in?Waterbank is in Western Australia (WA).Does postcode 6725 cover more than one suburb?Yes. Postcode 6725 covers 10 localities, so the postcode alone does not identify Waterbank. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.