Home Postcode finder QLD Glen Cairn Glen Cairn postcode QLD Glen Cairn is a locality in Queensland covered by postcode 4342. Postcode 4342 State or territory Queensland (QLD) Region Western Suburbs Add a free Glen Cairn business listing Be the first listing in Glen Cairn Common questionsWhat is the postcode for Glen Cairn?Glen Cairn, QLD has the postcode 4342.What state is Glen Cairn in?Glen Cairn is in Queensland (QLD).Does postcode 4342 cover more than one suburb?Yes. Postcode 4342 covers 6 localities, so the postcode alone does not identify Glen Cairn. Browse other postcodes in Queensland, or widen the search to every Australian postcode.