Home Postcode finder WA Mulga Downs Mulga Downs postcode WA Mulga Downs is a locality in Western Australia covered by postcode 6751. Postcode 6751 State or territory Western Australia (WA) Region North West Suburbs Add a free Mulga Downs business listing Be the first listing in Mulga Downs Common questionsWhat is the postcode for Mulga Downs?Mulga Downs, WA has the postcode 6751.What state is Mulga Downs in?Mulga Downs is in Western Australia (WA).Does postcode 6751 cover more than one suburb?Yes. Postcode 6751 covers 10 localities, so the postcode alone does not identify Mulga Downs. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.