Home Postcode finder WA Watercarrin Watercarrin postcode WA Watercarrin is a locality in Western Australia covered by postcode 6407. Postcode 6407 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Watercarrin business listing Be the first listing in Watercarrin Common questionsWhat is the postcode for Watercarrin?Watercarrin, WA has the postcode 6407.What state is Watercarrin in?Watercarrin is in Western Australia (WA).Does postcode 6407 cover more than one suburb?Yes. Postcode 6407 covers 5 localities, so the postcode alone does not identify Watercarrin. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.