Home Postcodes by state WA 6609 Postcode 6609 6609 is the postcode for 3 localities in WA: Dalwallinu, Nugadong and Xantippe. Localities with postcode 6609DalwallinuWANugadongWAXantippeWA Postcode 6609 State or territory Western Australia (WA) Localities 3 Council area Dalwallinu Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6608 · Postcode 6612