Home Postcodes by state WA 6751 Postcode 6751 6751 is the postcode for 10 localities in WA: Chichester, Innawanga, Juna Downs, Karijini, Mount Sheila, Mulga Downs and 4 more. Localities with postcode 6751ChichesterWAInnawangaWAJuna DownsWAKarijiniWAMount SheilaWAMulga DownsWANanutarraWARockleaWATom PriceWAWittenoomWA Postcode 6751 State or territory Western Australia (WA) Localities 10 Council area Ashburton Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6743 · Postcode 6753