Home Postcode finder WA Arthur River Arthur River postcode WA Arthur River is a locality in Western Australia covered by postcode 6315. Postcode 6315 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Arthur River business listing Be the first listing in Arthur River Common questionsWhat is the postcode for Arthur River?Arthur River, WA has the postcode 6315.What state is Arthur River in?Arthur River is in Western Australia (WA).Does postcode 6315 cover more than one suburb?Yes. Postcode 6315 covers 12 localities, so the postcode alone does not identify Arthur River. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.