Home Postcodes by state WA 6306 Postcode 6306 6306 is the postcode for 5 localities in WA: Aldersyde, Brookton, Bulyee, Jelcobine and Kweda. Localities with postcode 6306AldersydeWABrooktonWABulyeeWAJelcobineWAKwedaWA Postcode 6306 State or territory Western Australia (WA) Localities 5 Council area Brookton; Corrigin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6304 · Postcode 6308