Home Postcode finder QLD Loch Lomond Loch Lomond postcode QLD Loch Lomond is a locality in Queensland covered by postcode 4370. Postcode 4370 State or territory Queensland (QLD) Region Toowoomba Region Add a free Loch Lomond business listing Be the first listing in Loch Lomond Common questionsWhat is the postcode for Loch Lomond?Loch Lomond, QLD has the postcode 4370.What state is Loch Lomond in?Loch Lomond is in Queensland (QLD).Does postcode 4370 cover more than one suburb?Yes. Postcode 4370 covers 46 localities, so the postcode alone does not identify Loch Lomond. Browse other postcodes in Queensland, or widen the search to every Australian postcode.