Home Postcode finder WA Youndegin Youndegin postcode WA Youndegin is a locality in Western Australia covered by postcode 6407. Postcode 6407 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Youndegin business listing Be the first listing in Youndegin Common questionsWhat is the postcode for Youndegin?Youndegin, WA has the postcode 6407.What state is Youndegin in?Youndegin is in Western Australia (WA).Does postcode 6407 cover more than one suburb?Yes. Postcode 6407 covers 5 localities, so the postcode alone does not identify Youndegin. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.