Home Postcodes by state WA 6743 Postcode 6743 6743 is the postcode for 6 localities in WA: Cambridge Gulf, Durack, Gibb, Kununurra, Lake Argyle and Warmun. Localities with postcode 6743Cambridge GulfWADurackWAGibbWAKununurraWALake ArgyleWAWarmunWA Postcode 6743 State or territory Western Australia (WA) Localities 6 Council area Wyndham-East Kimberley; Halls Creek Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6740 · Postcode 6751