Home Postcodes by state WA 6104 Postcode 6104 6104 is the postcode for 3 localities in WA: Ascot, Belmont and Redcliffe. Localities with postcode 6104AscotWABelmontWARedcliffeWA Postcode 6104 State or territory Western Australia (WA) Localities 3 Council area Belmont Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6103 · Postcode 6105