Home Postcode finder WA Mount Magnet Mount Magnet postcode WA Mount Magnet is a locality in Western Australia covered by postcode 6638. Postcode 6638 State or territory Western Australia (WA) Region North West Suburbs Add a free Mount Magnet business listing More business listings in Mount Magnet Businesses in Mount MagnetMt Magnet District High SchoolLaurie St · 08 99634081 Common questionsWhat is the postcode for Mount Magnet?Mount Magnet, WA has the postcode 6638.What state is Mount Magnet in?Mount Magnet is in Western Australia (WA).Does postcode 6638 cover more than one suburb?Yes. Postcode 6638 covers 4 localities, so the postcode alone does not identify Mount Magnet. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.