Home Postcode finder QLD Lake Mary Lake Mary postcode QLD Lake Mary is a locality in Queensland covered by postcode 4703. Postcode 4703 State or territory Queensland (QLD) Region Central QLD Add a free Lake Mary business listing Be the first listing in Lake Mary Common questionsWhat is the postcode for Lake Mary?Lake Mary, QLD has the postcode 4703.What state is Lake Mary in?Lake Mary is in Queensland (QLD).Does postcode 4703 cover more than one suburb?Yes. Postcode 4703 covers 30 localities, so the postcode alone does not identify Lake Mary. Browse other postcodes in Queensland, or widen the search to every Australian postcode.