Home Postcode finder WA Forrest Forrest postcode WA Forrest 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 Forrest business listing Be the first listing in Forrest Common questionsWhat is the postcode for Forrest?Forrest, WA has the postcode 6434.What state is Forrest in?Forrest 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 Forrest. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.