Home Postcodes by state WA 6740 Postcode 6740 6740 is the postcode for 6 localities in WA: Drysdale River, Kalumburu, Mitchell Plateau, Oombulgurri, Prince Regent River and Wyndham. Localities with postcode 6740Drysdale RiverWAKalumburuWAMitchell PlateauWAOombulgurriWAPrince Regent RiverWAWyndhamWA Postcode 6740 State or territory Western Australia (WA) Localities 6 Council area Wyndham-East Kimberley Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6733 · Postcode 6743