Home Postcode finder WA South Newdegate South Newdegate postcode WA South Newdegate is a locality in Western Australia covered by postcode 6355. Postcode 6355 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free South Newdegate business listing Be the first listing in South Newdegate Common questionsWhat is the postcode for South Newdegate?South Newdegate, WA has the postcode 6355.What state is South Newdegate in?South Newdegate is in Western Australia (WA).Does postcode 6355 cover more than one suburb?Yes. Postcode 6355 covers 11 localities, so the postcode alone does not identify South Newdegate. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.