Home Postcode finder WA Muntadgin Muntadgin postcode WA Muntadgin is a locality in Western Australia covered by postcode 6420. Postcode 6420 State or territory Western Australia (WA) Region Wa Subs 1 G Flds Add a free Muntadgin business listing Be the first listing in Muntadgin Common questionsWhat is the postcode for Muntadgin?Muntadgin, WA has the postcode 6420.What state is Muntadgin in?Muntadgin is in Western Australia (WA).Does postcode 6420 cover more than one suburb?Yes. Postcode 6420 covers 2 localities, so the postcode alone does not identify Muntadgin. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.