Home Postcodes by state WA 6359 Postcode 6359 6359 is the postcode for 2 localities in WA: Forrestania and Hyden. Localities with postcode 6359ForrestaniaWAHydenWA Postcode 6359 State or territory Western Australia (WA) Localities 2 Council area Kondinin Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6358 · Postcode 6361