Home Postcode finder WA Weld Range Weld Range postcode WA Weld Range is a locality in Western Australia covered by postcode 6640. Postcode 6640 State or territory Western Australia (WA) Region North West Suburbs Add a free Weld Range business listing Be the first listing in Weld Range Common questionsWhat is the postcode for Weld Range?Weld Range, WA has the postcode 6640.What state is Weld Range in?Weld Range is in Western Australia (WA).Does postcode 6640 cover more than one suburb?Yes. Postcode 6640 covers 5 localities, so the postcode alone does not identify Weld Range. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.