Home Postcodes by state WA 6511 Postcode 6511 6511 is the postcode for Cervantes, WA. Localities with postcode 6511CervantesWA Postcode 6511 State or territory Western Australia (WA) Localities 1 Council area Dandaragan Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6510 · Postcode 6512