Home Postcode finder WA Drysdale River Drysdale River postcode WA Drysdale River is a locality in Western Australia covered by postcode 6740. Postcode 6740 State or territory Western Australia (WA) Region North West Suburbs Add a free Drysdale River business listing Be the first listing in Drysdale River Common questionsWhat is the postcode for Drysdale River?Drysdale River, WA has the postcode 6740.What state is Drysdale River in?Drysdale River is in Western Australia (WA).Does postcode 6740 cover more than one suburb?Yes. Postcode 6740 covers 6 localities, so the postcode alone does not identify Drysdale River. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.