Home Postcodes by state WA 6728 Postcode 6728 6728 is the postcode for 8 localities in WA: Camballin, Derby, Geegully Creek, Kimbolton, King Leopold Ranges, Meda and 2 more. Localities with postcode 6728CamballinWADerbyWAGeegully CreekWAKimboltonWAKing Leopold RangesWAMedaWASt George RangesWAWillareWA Postcode 6728 State or territory Western Australia (WA) Localities 8 Council area Derby-West Kimberley Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6726 · Postcode 6733