Home Postcode finder WA Monjebup Monjebup postcode WA Monjebup is a locality in Western Australia covered by postcode 6338. Postcode 6338 State or territory Western Australia (WA) Region Wa Subs 2 Gsr Add a free Monjebup business listing Be the first listing in Monjebup Common questionsWhat is the postcode for Monjebup?Monjebup, WA has the postcode 6338.What state is Monjebup in?Monjebup is in Western Australia (WA).Does postcode 6338 cover more than one suburb?Yes. Postcode 6338 covers 9 localities, so the postcode alone does not identify Monjebup. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.