Home Postcodes by state WA 6473 Postcode 6473 6473 is the postcode for 2 localities in WA: North Wialki and Wialki. Localities with postcode 6473North WialkiWAWialkiWA Postcode 6473 State or territory Western Australia (WA) Localities 2 Council area Mukinbudin; Mainly Mount Marshall, partly Mukinbudin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6472 · Postcode 6475