Home Postcodes by state WA 6396 Postcode 6396 6396 is the postcode for Frankland River, WA. Localities with postcode 6396Frankland RiverWA Postcode 6396 State or territory Western Australia (WA) Localities 1 Council area Cranbrook Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6395 · Postcode 6397