Home Postcode finder WA Westdale Westdale postcode WA Westdale is a locality in Western Australia covered by postcode 6304. Postcode 6304 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Westdale business listing Be the first listing in Westdale Common questionsWhat is the postcode for Westdale?Westdale, WA has the postcode 6304.What state is Westdale in?Westdale is in Western Australia (WA).Does postcode 6304 cover more than one suburb?Yes. Postcode 6304 covers 7 localities, so the postcode alone does not identify Westdale. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.