Home Postcodes by state WA 6434 Postcode 6434 6434 is the postcode for 5 localities in WA: Cundeelee, Forrest, Parkeston, Rawlinna and Zanthus. Localities with postcode 6434CundeeleeWAForrestWAParkestonWARawlinnaWAZanthusWA Postcode 6434 State or territory Western Australia (WA) Localities 5 Council area Kalgoorlie-Boulder Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6432 · Postcode 6436