Home Postcode finder QLD Milbong Milbong postcode QLD Milbong is a locality in Queensland covered by postcode 4310. Postcode 4310 State or territory Queensland (QLD) Region Western Suburbs Add a free Milbong business listing Be the first listing in Milbong Common questionsWhat is the postcode for Milbong?Milbong, QLD has the postcode 4310.What state is Milbong in?Milbong is in Queensland (QLD).Does postcode 4310 cover more than one suburb?Yes. Postcode 4310 covers 26 localities, so the postcode alone does not identify Milbong. Browse other postcodes in Queensland, or widen the search to every Australian postcode.