Home Postcodes by state WA 6351 Postcode 6351 6351 is the postcode for 2 localities in WA: Moulyinning and North Moulyinning. Localities with postcode 6351MoulyinningWANorth MoulyinningWA Postcode 6351 State or territory Western Australia (WA) Localities 2 Council area Dumbleyung Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6350 · Postcode 6352