Home Postcodes by state WA 6369 Postcode 6369 6369 is the postcode for 5 localities in WA: Mount Walker, Narembeen, Wadderin, West Holleton and Woolocutty. Localities with postcode 6369Mount WalkerWANarembeenWAWadderinWAWest HolletonWAWoolocuttyWA Postcode 6369 State or territory Western Australia (WA) Localities 5 Council area Narembeen Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6368 · Postcode 6370