Home Postcodes by state WA 6350 Postcode 6350 6350 is the postcode for 3 localities in WA: Dumbleyung, Nairibin and Nippering. Localities with postcode 6350DumbleyungWANairibinWANipperingWA Postcode 6350 State or territory Western Australia (WA) Localities 3 Council area Dumbleyung Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6348 · Postcode 6351