Home Postcode finder WA Granville Granville postcode WA Granville is a locality in Western Australia covered by postcode 6503. Postcode 6503 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Granville business listing Be the first listing in Granville Common questionsWhat is the postcode for Granville?Granville, WA has the postcode 6503.What state is Granville in?Granville is in Western Australia (WA).Does postcode 6503 cover more than one suburb?Yes. Postcode 6503 covers 20 localities, so the postcode alone does not identify Granville. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.