Home Postcode finder WA Thevenard Island Thevenard Island postcode WA Thevenard Island is a locality in Western Australia covered by postcode 6711. Postcode 6711 State or territory Western Australia (WA) Region North West Suburbs Add a free Thevenard Island business listing Be the first listing in Thevenard Island Common questionsWhat is the postcode for Thevenard Island?Thevenard Island, WA has the postcode 6711.What state is Thevenard Island in?Thevenard Island is in Western Australia (WA).Does postcode 6711 cover more than one suburb?No. Postcode 6711 covers Thevenard Island only, which is unusual - most Australian postcodes cover several localities. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.