Home Postcodes by state WA 6320 Postcode 6320 6320 is the postcode for 7 localities in WA: Bobalong, Borderdale, Dartnall, Lake Toolbrunup, Moonies Hill, Tambellup and 1 more. Localities with postcode 6320BobalongWABorderdaleWADartnallWALake ToolbrunupWAMoonies HillWATambellupWAWansbroughWA Postcode 6320 State or territory Western Australia (WA) Localities 7 Council area Broomehill-Tambellup Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6318 · Postcode 6321