Home Postcode finder WA Beaumont Beaumont postcode WA Beaumont is a locality in Western Australia covered by postcode 6450. Postcode 6450 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Beaumont business listing Be the first listing in Beaumont Common questionsWhat is the postcode for Beaumont?Beaumont, WA has the postcode 6450.What state is Beaumont in?Beaumont is in Western Australia (WA).Does postcode 6450 cover more than one suburb?Yes. Postcode 6450 covers 23 localities, so the postcode alone does not identify Beaumont. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.