Home Postcodes by state WA Millstream Millstream postcode WA Millstream is a locality in Western Australia covered by postcode 6716. Postcode 6716 State or territory Western Australia (WA) Region North West Suburbs Council area Ashburton Council area based on Australian Bureau of Statistics data (ASGS Edition 3), CC BY 4.0. Add a free Millstream business listing Be the first listing in Millstream Also in postcode 6716FortescueWA 6716Hamersley RangeWA 6716PannawonicaWA 6716 Other places called MillstreamMillstreamQLD 4888 Common questionsWhat is the postcode for Millstream?Millstream, WA has the postcode 6716.What state is Millstream in?Millstream is in Western Australia (WA).What council is Millstream in?Millstream is in the Ashburton local government area.Does postcode 6716 cover more than one suburb?Yes. Postcode 6716 covers 4 localities, so the postcode alone does not identify Millstream. Browse other postcodes in Western Australia, or widen the search to every Australian postcode.