Home Postcode finder QLD Middlebrook Middlebrook postcode QLD Middlebrook is a locality in Queensland covered by postcode 4886. Postcode 4886 State or territory Queensland (QLD) Region North QLD Add a free Middlebrook business listing Be the first listing in Middlebrook Common questionsWhat is the postcode for Middlebrook?Middlebrook, QLD has the postcode 4886.What state is Middlebrook in?Middlebrook is in Queensland (QLD).Does postcode 4886 cover more than one suburb?Yes. Postcode 4886 covers 8 localities, so the postcode alone does not identify Middlebrook. Browse other postcodes in Queensland, or widen the search to every Australian postcode.