Home Postcode finder WA St George Ranges St George Ranges postcode WA St George Ranges is a locality in Western Australia covered by postcode 6728. Postcode 6728 State or territory Western Australia (WA) Region North West Suburbs Add a free St George Ranges business listing Be the first listing in St George Ranges Common questionsWhat is the postcode for St George Ranges?St George Ranges, WA has the postcode 6728.What state is St George Ranges in?St George Ranges is in Western Australia (WA).Does postcode 6728 cover more than one suburb?Yes. Postcode 6728 covers 8 localities, so the postcode alone does not identify St George Ranges. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.