Home Postcodes by state WA 6171 Postcode 6171 6171 is the postcode for Baldivis, WA. Localities with postcode 6171BaldivisWA Postcode 6171 State or territory Western Australia (WA) Localities 1 Council area Rockingham Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6170 · Postcode 6172