Home Postcodes by state WA 6074 Postcode 6074 6074 is the postcode for Sawyers Valley, WA. Localities with postcode 6074Sawyers ValleyWA Postcode 6074 State or territory Western Australia (WA) Localities 1 Council area Mundaring Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6073 · Postcode 6076