Home Postcode finder WA Wadderin Wadderin postcode WA Wadderin is a locality in Western Australia covered by postcode 6369. Postcode 6369 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Wadderin business listing Be the first listing in Wadderin Common questionsWhat is the postcode for Wadderin?Wadderin, WA has the postcode 6369.What state is Wadderin in?Wadderin is in Western Australia (WA).Does postcode 6369 cover more than one suburb?Yes. Postcode 6369 covers 5 localities, so the postcode alone does not identify Wadderin. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.