Home Postcode finder QLD Broxburn Broxburn postcode QLD Broxburn is a locality in Queensland covered by postcode 4356. Postcode 4356 State or territory Queensland (QLD) Region Toowoomba Region Add a free Broxburn business listing Be the first listing in Broxburn Common questionsWhat is the postcode for Broxburn?Broxburn, QLD has the postcode 4356.What state is Broxburn in?Broxburn is in Queensland (QLD).Does postcode 4356 cover more than one suburb?Yes. Postcode 4356 covers 18 localities, so the postcode alone does not identify Broxburn. Browse other postcodes in Queensland, or widen the search to every Australian postcode.