Home Postcode finder WA Mount Sheila Mount Sheila postcode WA Mount Sheila 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 Mount Sheila business listing Be the first listing in Mount Sheila Common questionsWhat is the postcode for Mount Sheila?Mount Sheila, WA has the postcode 6751.What state is Mount Sheila in?Mount Sheila 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 Mount Sheila. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.