Home Postcodes by state WA 6489 Postcode 6489 6489 is the postcode for 3 localities in WA: Kununoppin, North Kununoppin and South Kununoppin. Localities with postcode 6489KununoppinWANorth KununoppinWASouth KununoppinWA Postcode 6489 State or territory Western Australia (WA) Localities 3 Council area Trayning Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6488 · Postcode 6490