Home Postcode finder WA Parkeston Parkeston postcode WA Parkeston is a locality in Western Australia covered by postcode 6434. Postcode 6434 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Parkeston business listing Be the first listing in Parkeston Common questionsWhat is the postcode for Parkeston?Parkeston, WA has the postcode 6434.What state is Parkeston in?Parkeston is in Western Australia (WA).Does postcode 6434 cover more than one suburb?Yes. Postcode 6434 covers 5 localities, so the postcode alone does not identify Parkeston. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.