Home Postcode finder WA Greenwoods Valley Greenwoods Valley postcode WA Greenwoods Valley is a locality in Western Australia covered by postcode 6405. Postcode 6405 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Greenwoods Valley business listing Be the first listing in Greenwoods Valley Common questionsWhat is the postcode for Greenwoods Valley?Greenwoods Valley, WA has the postcode 6405.What state is Greenwoods Valley in?Greenwoods Valley is in Western Australia (WA).Does postcode 6405 cover more than one suburb?Yes. Postcode 6405 covers 4 localities, so the postcode alone does not identify Greenwoods Valley. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.