Home Postcodes by state WA 6070 Postcode 6070 6070 is the postcode for Darlington, WA. Localities with postcode 6070DarlingtonWA Postcode 6070 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 6069 · Postcode 6071