Home Postcodes by state WA 6438 Postcode 6438 6438 is the postcode for 2 localities in WA: Lake Darlot and Leonora. Localities with postcode 6438Lake DarlotWALeonoraWA Postcode 6438 State or territory Western Australia (WA) Localities 2 Council area Leonora Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6437 · Postcode 6440