Home Postcodes by state WA 6616 Postcode 6616 6616 is the postcode for Latham, WA. Localities with postcode 6616LathamWA Postcode 6616 State or territory Western Australia (WA) Localities 1 Council area Perenjori Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Postcode 6614 · Postcode 6620