Home Postcodes by state WA 6765 Postcode 6765 6765 is the postcode for 2 localities in WA: Fitzroy Crossing and Mount Hardman. Localities with postcode 6765Fitzroy CrossingWAMount HardmanWA Postcode 6765 State or territory Western Australia (WA) Localities 2 Council area Derby-West Kimberley Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6762 · Postcode 6770