Home Postcode finder WA Grey Grey postcode WA Grey is a locality in Western Australia covered by postcode 6521. Postcode 6521 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Grey business listing Be the first listing in Grey Common questionsWhat is the postcode for Grey?Grey, WA has the postcode 6521.What state is Grey in?Grey is in Western Australia (WA).Does postcode 6521 cover more than one suburb?Yes. Postcode 6521 covers 5 localities, so the postcode alone does not identify Grey. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.