Home Postcode finder QLD Millstream Millstream postcode QLD Millstream is a locality in Queensland covered by postcode 4888. Postcode 4888 State or territory Queensland (QLD) Region North QLD Add a free Millstream business listing Be the first listing in Millstream Common questionsWhat is the postcode for Millstream?Millstream, QLD has the postcode 4888.What state is Millstream in?Millstream is in Queensland (QLD).Does postcode 4888 cover more than one suburb?Yes. Postcode 4888 covers 5 localities, so the postcode alone does not identify Millstream. Browse other postcodes in Queensland, or widen the search to every Australian postcode.