Home Postcode finder WA West River West River postcode WA West River is a locality in Western Australia covered by postcode 6346. Postcode 6346 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free West River business listing Be the first listing in West River Common questionsWhat is the postcode for West River?West River, WA has the postcode 6346.What state is West River in?West River is in Western Australia (WA).Does postcode 6346 cover more than one suburb?Yes. Postcode 6346 covers 4 localities, so the postcode alone does not identify West River. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.