Home Postcodes by state WA 6037 Postcode 6037 6037 is the postcode for Two Rocks, WA. Localities with postcode 6037Two RocksWA Postcode 6037 State or territory Western Australia (WA) Localities 1 Council area Wanneroo Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6036 · Postcode 6038