Home Postcode finder WA Muja Muja postcode WA Muja is a locality in Western Australia covered by postcode 6225. Postcode 6225 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Muja business listing Be the first listing in Muja Common questionsWhat is the postcode for Muja?Muja, WA has the postcode 6225.What state is Muja in?Muja is in Western Australia (WA).Does postcode 6225 cover more than one suburb?Yes. Postcode 6225 covers 18 localities, so the postcode alone does not identify Muja. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.