Home Postcode finder WA Cramphorne Cramphorne postcode WA Cramphorne is a locality in Western Australia covered by postcode 6420. Postcode 6420 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Cramphorne business listing Be the first listing in Cramphorne Common questionsWhat is the postcode for Cramphorne?Cramphorne, WA has the postcode 6420.What state is Cramphorne in?Cramphorne is in Western Australia (WA).Does postcode 6420 cover more than one suburb?Yes. Postcode 6420 covers 2 localities, so the postcode alone does not identify Cramphorne. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.