Home Postcode finder WA Miamoon Miamoon postcode WA Miamoon is a locality in Western Australia covered by postcode 6612. Postcode 6612 State or territory Western Australia (WA) Region Wa Subs 4 Coast Add a free Miamoon business listing Be the first listing in Miamoon Common questionsWhat is the postcode for Miamoon?Miamoon, WA has the postcode 6612.What state is Miamoon in?Miamoon is in Western Australia (WA).Does postcode 6612 cover more than one suburb?Yes. Postcode 6612 covers 4 localities, so the postcode alone does not identify Miamoon. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.