Home Postcodes by state WA 6716 Postcode 6716 6716 is the postcode for 4 localities in WA: Fortescue, Hamersley Range, Millstream and Pannawonica. Localities with postcode 6716FortescueWAHamersley RangeWAMillstreamWAPannawonicaWA Postcode 6716 State or territory Western Australia (WA) Localities 4 Council area Ashburton Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6714 · Postcode 6718