Home Postcode finder WA Sir Samuel Sir Samuel postcode WA Sir Samuel is a locality in Western Australia covered by postcode 6437. Postcode 6437 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Sir Samuel business listing Be the first listing in Sir Samuel Common questionsWhat is the postcode for Sir Samuel?Sir Samuel, WA has the postcode 6437.What state is Sir Samuel in?Sir Samuel is in Western Australia (WA).Does postcode 6437 cover more than one suburb?Yes. Postcode 6437 covers 2 localities, so the postcode alone does not identify Sir Samuel. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.