Home Postcode finder WA Warburton Warburton postcode WA Warburton is a locality in Western Australia covered by postcode 6431. Postcode 6431 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Warburton business listing Be the first listing in Warburton Common questionsWhat is the postcode for Warburton?Warburton, WA has the postcode 6431.What state is Warburton in?Warburton is in Western Australia (WA).Does postcode 6431 cover more than one suburb?Yes. Postcode 6431 covers 13 localities, so the postcode alone does not identify Warburton. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.