Home Postcode finder WA Mundijong Mundijong postcode WA Mundijong is a locality in Western Australia covered by postcode 6123. Postcode 6123 State or territory Western Australia (WA) Region North West Suburbs Add a free Mundijong business listing More business listings in Mundijong Businesses in MundijongMundijong Primary School16 Livesey St · 08 95255118Serpentine Jarrahdale Grammar School1 Bishop Rd · 08 99480000 Common questionsWhat is the postcode for Mundijong?Mundijong, WA has the postcode 6123.What state is Mundijong in?Mundijong is in Western Australia (WA).Does postcode 6123 cover more than one suburb?Yes. Postcode 6123 covers 2 localities, so the postcode alone does not identify Mundijong. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.