Home Postcodes by state WA 6705 Postcode 6705 6705 is the postcode for 4 localities in WA: East Lyons River, Gascoyne Junction, Gascoyne River and West Lyons River. Localities with postcode 6705East Lyons RiverWAGascoyne JunctionWAGascoyne RiverWAWest Lyons RiverWA Postcode 6705 State or territory Western Australia (WA) Localities 4 Council area Upper Gascoyne Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6701 · Postcode 6707