Home Postcode finder QLD Mount Julian Mount Julian postcode QLD Mount Julian is a locality in Queensland covered by postcode 4800. Postcode 4800 State or territory Queensland (QLD) Region Central QLD Add a free Mount Julian business listing Be the first listing in Mount Julian Common questionsWhat is the postcode for Mount Julian?Mount Julian, QLD has the postcode 4800.What state is Mount Julian in?Mount Julian is in Queensland (QLD).Does postcode 4800 cover more than one suburb?Yes. Postcode 4800 covers 38 localities, so the postcode alone does not identify Mount Julian. Browse other postcodes in Queensland, or widen the search to every Australian postcode.