Home Postcodes by state WA 6635 Postcode 6635 6635 is the postcode for 2 localities in WA: South Murchison and Yalgoo. Localities with postcode 6635South MurchisonWAYalgooWA Postcode 6635 State or territory Western Australia (WA) Localities 2 Council area Murchison; Yalgoo Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6632 · Postcode 6638