Home Postcode finder WA Mumballup Mumballup postcode WA Mumballup 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 Mumballup business listing Be the first listing in Mumballup Common questionsWhat is the postcode for Mumballup?Mumballup, WA has the postcode 6225.What state is Mumballup in?Mumballup 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 Mumballup. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.