Home Postcode finder QLD Mount Isa City Mount Isa City postcode QLD Mount Isa City is a locality in Queensland covered by postcode 4825. Postcode 4825 State or territory Queensland (QLD) Region North QLD Add a free Mount Isa City business listing Be the first listing in Mount Isa City Common questionsWhat is the postcode for Mount Isa City?Mount Isa City, QLD has the postcode 4825.What state is Mount Isa City in?Mount Isa City is in Queensland (QLD).Does postcode 4825 cover more than one suburb?Yes. Postcode 4825 covers 36 localities, so the postcode alone does not identify Mount Isa City. It also appears in 2 states or territories, so it does not identify a state either. Browse other postcodes in Queensland, or widen the search to every Australian postcode.