Home Postcodes by state WA 6243 Postcode 6243 6243 is the postcode for 2 localities in WA: Wilga and Wilga West. Localities with postcode 6243WilgaWAWilga WestWA Postcode 6243 State or territory Western Australia (WA) Localities 2 Council area Boyup Brook; Donnybrook-Balingup Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6240 · Postcode 6244