Home Postcodes by state WA 6172 Postcode 6172 6172 is the postcode for Port Kennedy, WA. Localities with postcode 6172Port KennedyWA Postcode 6172 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 6171 · Postcode 6173