Home Postcode finder WA Moondah Moondah postcode WA Moondah is a locality in Western Australia covered by postcode 6503. Postcode 6503 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Moondah business listing Be the first listing in Moondah Common questionsWhat is the postcode for Moondah?Moondah, WA has the postcode 6503.What state is Moondah in?Moondah is in Western Australia (WA).Does postcode 6503 cover more than one suburb?Yes. Postcode 6503 covers 20 localities, so the postcode alone does not identify Moondah. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.