Home Postcode finder WA Mullalyup Mullalyup postcode WA Mullalyup is a locality in Western Australia covered by postcode 6252. Postcode 6252 State or territory Western Australia (WA) Region Wa Subs 3 Sth Rd Add a free Mullalyup business listing Be the first listing in Mullalyup Common questionsWhat is the postcode for Mullalyup?Mullalyup, WA has the postcode 6252.What state is Mullalyup in?Mullalyup is in Western Australia (WA).Does postcode 6252 cover more than one suburb?No. Postcode 6252 covers Mullalyup only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.